How do I assign different values to variables?

[heyeruoqi]

I would like to implement giving a variable such as {{id}} a different value such as 7117 or 7843 etc. It is too much trouble to enter it manually each time, can the template do this? I can prepare the values of the variables in advance to enable more complex logical operations, e.g. I can easily select these variables by means of drop down menus etc.

[AB1908]

<%*
let var = 20;
%>

Elsewhere in file:

<% var %>

should do the trick.

[welpdx]

I would like to implement giving a variable such as {{id}} a different value

When you are using {{id}} you are using syntax from the Obsidian Built-in Plugin called Templates.

If you want to use this community Templater plugin, use the Eta templating syntax. It might take a bit to get used to, but with some tinkering I'm sure you will get it.

To set a value to a variable, the example above by @AB1908 an excellent answer.