Screencastify

Just tossing out another rec if anyone is interested. OBS Studio has a pretty good screen recorder built in. Much better than stuff I've used like Bandicam, etc. in the past. Free to download, no time limit, no watermarks. You can customize the bitrate and resolution in the settings if you'd like to keep the file sizes down. Then just use a program like Avidemux to crop and trim the clips or convert from flv to mp4 when you're finished recording.

OBS is also used for live-streaming, so if you ever have big dreams of becoming a rich successful camboy like I do, you got all bases covered