add screen recording tip thanks to @samanthacsik

approach/tooling.md

@@ -59,7 +59,8 @@ We send newsletters via Google Group following this procedure documented by [Sta
 
 upcoming
 
-## Quicktime video editing
+## Quicktime 
+### Video editing
 
 Sometimes we want to edit a Cohort Call recording to remove a section from the middle, e.g. Main room chat during breakouts.
 
@@ -83,6 +84,15 @@ Using Edit > Trim, it can be hard to control how fast the yellow Trim brackets m
 - Click Trim
 - Save
 
+### Screen recording
+
+Thanks to Sam Csik for this tip. 
+
+To make a screen recording without audio, on a Mac, use Quicktime. File > New screen recording > select options for what to share > to end recording, click Stop icon (black box at top of your screen). We can use the video editing instructions above to trim any rough start.
+
+Want to turn your video into a gif to have your screen recording play automatically (instead of having to press play on an embedded video) in a blog post or documentation? Upload your video to https://ezgif.com/video-to-gif/, select the frame rate that most closely matches the length of your video, in seconds.
+
+
 ## R/RStudio
 
 -   all websites and books