The Handbrake suggestion is a good one if your only interest is transcoding ... which barely scratches the breadth of what ffmpeg as a tool can do.

Try: https://amiaopensource.github.io/ffmprovisr/

for a 'better' ffmpeg CLI documentation, your mileage may vary, it's task and example focused.

Try: https://github.com/topics/ffmpeg-gui

for 66 variations on a GUI for ffmpeg of which I have no comment, I'm an old school CLI user through and through.