As I said earlier, for quick screenshots and screen recordings on Windows I use the free product sharex:
I use OBS (supports most O/Ss) for longer projects, or if I want to record from my webcam, or from several sources using Picture-in-Picture, or for recording HTML/CSS?Javascript animations. For a goot beginner’s tutorial see:
Kevin has quite a few OBS tutorials on his Youtube channel: https://www.youtube.com/results?search_query=stratvert+OBS