Tip #1: After you stop the recording, the thumbnail will appear in the bottom right corner of your screen. If you need to quickly share the video, you can drag and drop this thumbnail into Slack, GMail or other software. This option is convenient if you just need to share your screencast without saving it on your Mac.
Tip #2: To edit the video, click on that thumbnail and hit the Edit icon in the top right corner of the popup window.
Tip #3: To highlight mouse clicks (which is very convenient for the viewer), select "Options > Show mouse clicks".
Tip #4: If you need to make a GIF out of your screen recording, use a free online service for that (e.g. this one