I need to make a video recording my PC screen, and I found Open Broadcaster Software (OBS), which worked well for me.
YouTube tutorial: OBS Basic Tutorial 2016
The default is to record audio from mic, but if you want to record the sound from a browser or a video, you need to setup something different. See below.
How to record audio for Mac: https://www.youtube.com/watch?v=WTOCz8SorkY