diff --git a/.credo.exs b/.credo.exs
new file mode 100644
index 0000000..baa1ea2
--- /dev/null
+++ b/.credo.exs
@@ -0,0 +1,217 @@
+# This file contains the configuration for Credo and you are probably reading
+# this after creating it with `mix credo.gen.config`.
+#
+# If you find anything wrong or unclear in this file, please report an
+# issue on GitHub: https://github.com/rrrene/credo/issues
+#
+%{
+  #
+  # You can have as many configs as you like in the `configs:` field.
+  configs: [
+    %{
+      #
+      # Run any config using `mix credo -C <name>`. If no config name is given
+      # "default" is used.
+      #
+      name: "default",
+      #
+      # These are the files included in the analysis:
+      files: %{
+        #
+        # You can give explicit globs or simply directories.
+        # In the latter case `**/*.{ex,exs}` will be used.
+        #
+        included: [
+          "lib/",
+          "src/",
+          "test/",
+          "web/",
+          "apps/*/lib/",
+          "apps/*/src/",
+          "apps/*/test/",
+          "apps/*/web/"
+        ],
+        excluded: [~r"/_build/", ~r"/deps/", ~r"/node_modules/"]
+      },
+      #
+      # Load and configure plugins here:
+      #
+      plugins: [],
+      #
+      # If you create your own checks, you must specify the source files for
+      # them here, so they can be loaded by Credo before running the analysis.
+      #
+      requires: [],
+      #
+      # If you want to enforce a style guide and need a more traditional linting
+      # experience, you can change `strict` to `true` below:
+      #
+      strict: false,
+      #
+      # To modify the timeout for parsing files, change this value:
+      #
+      parse_timeout: 5000,
+      #
+      # If you want to use uncolored output by default, you can change `color`
+      # to `false` below:
+      #
+      color: true,
+      #
+      # You can customize the parameters of any check by adding a second element
+      # to the tuple.
+      #
+      # To disable a check put `false` as second element:
+      #
+      #     {Credo.Check.Design.DuplicatedCode, false}
+      #
+      checks: %{
+        enabled: [
+          #
+          ## Consistency Checks
+          #
+          {Credo.Check.Consistency.ExceptionNames, []},
+          {Credo.Check.Consistency.LineEndings, []},
+          {Credo.Check.Consistency.ParameterPatternMatching, []},
+          {Credo.Check.Consistency.SpaceAroundOperators, []},
+          {Credo.Check.Consistency.SpaceInParentheses, []},
+          {Credo.Check.Consistency.TabsOrSpaces, []},
+
+          #
+          ## Design Checks
+          #
+          # You can customize the priority of any check
+          # Priority values are: `low, normal, high, higher`
+          #
+          {Credo.Check.Design.AliasUsage,
+           [priority: :low, if_nested_deeper_than: 2, if_called_more_often_than: 0]},
+          {Credo.Check.Design.TagFIXME, []},
+          # You can also customize the exit_status of each check.
+          # If you don't want TODO comments to cause `mix credo` to fail, just
+          # set this value to 0 (zero).
+          #
+          {Credo.Check.Design.TagTODO, [exit_status: 2]},
+
+          #
+          ## Readability Checks
+          #
+          {Credo.Check.Readability.AliasOrder, []},
+          {Credo.Check.Readability.FunctionNames, []},
+          {Credo.Check.Readability.LargeNumbers, []},
+          {Credo.Check.Readability.MaxLineLength, [priority: :low, max_length: 120]},
+          {Credo.Check.Readability.ModuleAttributeNames, []},
+          {Credo.Check.Readability.ModuleDoc, []},
+          {Credo.Check.Readability.ModuleNames, []},
+          {Credo.Check.Readability.ParenthesesInCondition, []},
+          {Credo.Check.Readability.ParenthesesOnZeroArityDefs, []},
+          {Credo.Check.Readability.PipeIntoAnonymousFunctions, []},
+          {Credo.Check.Readability.PredicateFunctionNames, []},
+          {Credo.Check.Readability.PreferImplicitTry, []},
+          {Credo.Check.Readability.RedundantBlankLines, []},
+          {Credo.Check.Readability.Semicolons, []},
+          {Credo.Check.Readability.SpaceAfterCommas, []},
+          {Credo.Check.Readability.StringSigils, []},
+          {Credo.Check.Readability.TrailingBlankLine, []},
+          {Credo.Check.Readability.TrailingWhiteSpace, []},
+          {Credo.Check.Readability.UnnecessaryAliasExpansion, []},
+          {Credo.Check.Readability.VariableNames, []},
+          {Credo.Check.Readability.WithSingleClause, []},
+
+          #
+          ## Refactoring Opportunities
+          #
+          {Credo.Check.Refactor.Apply, []},
+          {Credo.Check.Refactor.CondStatements, []},
+          {Credo.Check.Refactor.CyclomaticComplexity, []},
+          {Credo.Check.Refactor.FilterCount, []},
+          {Credo.Check.Refactor.FilterFilter, []},
+          {Credo.Check.Refactor.FunctionArity, []},
+          {Credo.Check.Refactor.LongQuoteBlocks, []},
+          {Credo.Check.Refactor.MapJoin, []},
+          {Credo.Check.Refactor.MatchInCondition, []},
+          {Credo.Check.Refactor.NegatedConditionsInUnless, []},
+          {Credo.Check.Refactor.NegatedConditionsWithElse, []},
+          {Credo.Check.Refactor.Nesting, []},
+          {Credo.Check.Refactor.RedundantWithClauseResult, []},
+          {Credo.Check.Refactor.RejectReject, []},
+          {Credo.Check.Refactor.UnlessWithElse, []},
+          {Credo.Check.Refactor.WithClauses, []},
+
+          #
+          ## Warnings
+          #
+          {Credo.Check.Warning.ApplicationConfigInModuleAttribute, []},
+          {Credo.Check.Warning.BoolOperationOnSameValues, []},
+          {Credo.Check.Warning.Dbg, []},
+          {Credo.Check.Warning.ExpensiveEmptyEnumCheck, []},
+          {Credo.Check.Warning.IExPry, []},
+          {Credo.Check.Warning.IoInspect, []},
+          {Credo.Check.Warning.MissedMetadataKeyInLoggerConfig, []},
+          {Credo.Check.Warning.OperationOnSameValues, []},
+          {Credo.Check.Warning.OperationWithConstantResult, []},
+          {Credo.Check.Warning.RaiseInsideRescue, []},
+          {Credo.Check.Warning.SpecWithStruct, []},
+          {Credo.Check.Warning.UnsafeExec, []},
+          {Credo.Check.Warning.UnusedEnumOperation, []},
+          {Credo.Check.Warning.UnusedFileOperation, []},
+          {Credo.Check.Warning.UnusedKeywordOperation, []},
+          {Credo.Check.Warning.UnusedListOperation, []},
+          {Credo.Check.Warning.UnusedPathOperation, []},
+          {Credo.Check.Warning.UnusedRegexOperation, []},
+          {Credo.Check.Warning.UnusedStringOperation, []},
+          {Credo.Check.Warning.UnusedTupleOperation, []},
+          {Credo.Check.Warning.WrongTestFileExtension, []}
+        ],
+        disabled: [
+          #
+          # Checks scheduled for next check update (opt-in for now)
+          {Credo.Check.Refactor.UtcNowTruncate, []},
+
+          #
+          # Controversial and experimental checks (opt-in, just move the check to `:enabled`
+          #   and be sure to use `mix credo --strict` to see low priority checks)
+          #
+          {Credo.Check.Consistency.MultiAliasImportRequireUse, []},
+          {Credo.Check.Consistency.UnusedVariableNames, []},
+          {Credo.Check.Design.DuplicatedCode, []},
+          {Credo.Check.Design.SkipTestWithoutComment, []},
+          {Credo.Check.Readability.AliasAs, []},
+          {Credo.Check.Readability.BlockPipe, []},
+          {Credo.Check.Readability.ImplTrue, []},
+          {Credo.Check.Readability.MultiAlias, []},
+          {Credo.Check.Readability.NestedFunctionCalls, []},
+          {Credo.Check.Readability.OneArityFunctionInPipe, []},
+          {Credo.Check.Readability.OnePipePerLine, []},
+          {Credo.Check.Readability.SeparateAliasRequire, []},
+          {Credo.Check.Readability.SingleFunctionToBlockPipe, []},
+          {Credo.Check.Readability.SinglePipe, []},
+          {Credo.Check.Readability.Specs, []},
+          {Credo.Check.Readability.StrictModuleLayout, []},
+          {Credo.Check.Readability.WithCustomTaggedTuple, []},
+          {Credo.Check.Refactor.ABCSize, []},
+          {Credo.Check.Refactor.AppendSingleItem, []},
+          {Credo.Check.Refactor.DoubleBooleanNegation, []},
+          {Credo.Check.Refactor.FilterReject, []},
+          {Credo.Check.Refactor.IoPuts, []},
+          {Credo.Check.Refactor.MapMap, []},
+          {Credo.Check.Refactor.ModuleDependencies, []},
+          {Credo.Check.Refactor.NegatedIsNil, []},
+          {Credo.Check.Refactor.PassAsyncInTestCases, []},
+          {Credo.Check.Refactor.PipeChainStart, []},
+          {Credo.Check.Refactor.RejectFilter, []},
+          {Credo.Check.Refactor.VariableRebinding, []},
+          {Credo.Check.Warning.LazyLogging, []},
+          {Credo.Check.Warning.LeakyEnvironment, []},
+          {Credo.Check.Warning.MapGetUnsafePass, []},
+          {Credo.Check.Warning.MixEnv, []},
+          {Credo.Check.Warning.UnsafeToAtom, []}
+
+          # {Credo.Check.Refactor.MapInto, []},
+
+          #
+          # Custom checks can be created using `mix credo.gen.check`.
+          #
+        ]
+      }
+    }
+  ]
+}
diff --git a/lib/kotisivut/accounts.ex b/lib/kotisivut/accounts.ex
index d4f296d..811c74c 100644
--- a/lib/kotisivut/accounts.ex
+++ b/lib/kotisivut/accounts.ex
@@ -6,7 +6,7 @@ defmodule Kotisivut.Accounts do
   import Ecto.Query, warn: false
   alias Kotisivut.Repo
 
-  alias Kotisivut.Accounts.{User, UserToken, UserNotifier}
+  alias Kotisivut.Accounts.{User, UserNotifier, UserToken}
 
   ## Database getters
 
diff --git a/lib/kotisivut/accounts/user.ex b/lib/kotisivut/accounts/user.ex
index 1be1ddc..8eb1157 100644
--- a/lib/kotisivut/accounts/user.ex
+++ b/lib/kotisivut/accounts/user.ex
@@ -1,4 +1,8 @@
 defmodule Kotisivut.Accounts.User do
+  @moduledoc """
+  Schema for Users see Doc
+  """
+
   use Ecto.Schema
   import Ecto.Changeset
 
diff --git a/lib/kotisivut/accounts/user_notifier.ex b/lib/kotisivut/accounts/user_notifier.ex
index fd06334..ff3e530 100644
--- a/lib/kotisivut/accounts/user_notifier.ex
+++ b/lib/kotisivut/accounts/user_notifier.ex
@@ -1,4 +1,8 @@
 defmodule Kotisivut.Accounts.UserNotifier do
+  @moduledoc """
+  UserNotifier TODO
+  """
+
   import Swoosh.Email
 
   alias Kotisivut.Mailer
diff --git a/lib/kotisivut/accounts/user_token.ex b/lib/kotisivut/accounts/user_token.ex
index 03aa63d..dc2d161 100644
--- a/lib/kotisivut/accounts/user_token.ex
+++ b/lib/kotisivut/accounts/user_token.ex
@@ -1,4 +1,8 @@
 defmodule Kotisivut.Accounts.UserToken do
+  @moduledoc """
+  Schema for UserTokens, read comments for more
+  """
+
   use Ecto.Schema
   import Ecto.Query
   alias Kotisivut.Accounts.UserToken
diff --git a/lib/kotisivut/blog/post.ex b/lib/kotisivut/blog/post.ex
index 6ba2d84..cf144e6 100644
--- a/lib/kotisivut/blog/post.ex
+++ b/lib/kotisivut/blog/post.ex
@@ -1,4 +1,8 @@
 defmodule Kotisivut.Blog.Post do
+  @moduledoc """
+  Schema for Posts
+  """
+
   use Ecto.Schema
   import Ecto.Changeset
 
diff --git a/lib/kotisivut_web/components/core_components.ex b/lib/kotisivut_web/components/core_components.ex
index 0a711ec..35fa756 100644
--- a/lib/kotisivut_web/components/core_components.ex
+++ b/lib/kotisivut_web/components/core_components.ex
@@ -16,7 +16,10 @@ defmodule KotisivutWeb.CoreComponents do
   """
   use Phoenix.Component
 
+  # my change
+  alias Phoenix.HTML.Form, as: PHF
   alias Phoenix.LiveView.JS
+
   import KotisivutWeb.Gettext
 
   @doc """
@@ -305,7 +308,7 @@ defmodule KotisivutWeb.CoreComponents do
   def input(%{type: "checkbox"} = assigns) do
     assigns =
       assign_new(assigns, :checked, fn ->
-        Phoenix.HTML.Form.normalize_value("checkbox", assigns[:value])
+        PHF.normalize_value("checkbox", assigns[:value])
       end)
 
     ~H"""
diff --git a/lib/kotisivut_web/user_auth.ex b/lib/kotisivut_web/user_auth.ex
index 8c002f5..b5295b5 100644
--- a/lib/kotisivut_web/user_auth.ex
+++ b/lib/kotisivut_web/user_auth.ex
@@ -1,4 +1,8 @@
 defmodule KotisivutWeb.UserAuth do
+  @moduledoc """
+  User auth see doc
+  """
+
   use KotisivutWeb, :verified_routes
 
   import Plug.Conn
diff --git a/test/kotisivut_web/user_auth_test.exs b/test/kotisivut_web/user_auth_test.exs
index cac4c5d..b8c591d 100644
--- a/test/kotisivut_web/user_auth_test.exs
+++ b/test/kotisivut_web/user_auth_test.exs
@@ -1,9 +1,10 @@
 defmodule KotisivutWeb.UserAuthTest do
   use KotisivutWeb.ConnCase, async: true
 
-  alias Phoenix.LiveView
   alias Kotisivut.Accounts
   alias KotisivutWeb.UserAuth
+  alias Phoenix.LiveView
+
   import Kotisivut.AccountsFixtures
 
   @remember_me_cookie "_kotisivut_web_user_remember_me"
diff --git a/test/support/data_case.ex b/test/support/data_case.ex
index 48b6a9a..18774e5 100644
--- a/test/support/data_case.ex
+++ b/test/support/data_case.ex
@@ -13,6 +13,7 @@ defmodule Kotisivut.DataCase do
   by setting `use Kotisivut.DataCase, async: true`, although
   this option is not recommended for other databases.
   """
+  alias Ecto.Adapters.SQL.Sandbox, as: EASS
 
   use ExUnit.CaseTemplate
 
@@ -36,8 +37,8 @@ defmodule Kotisivut.DataCase do
   Sets up the sandbox based on the test tags.
   """
   def setup_sandbox(tags) do
-    pid = Ecto.Adapters.SQL.Sandbox.start_owner!(Kotisivut.Repo, shared: not tags[:async])
-    on_exit(fn -> Ecto.Adapters.SQL.Sandbox.stop_owner(pid) end)
+    pid = EASS.start_owner!(Kotisivut.Repo, shared: not tags[:async])
+    on_exit(fn -> EASS.stop_owner(pid) end)
   end
 
   @doc """