iMovie: de basics leren
https://devideomakers.nl/video-bewerken-de-basics-van-apples-imovie
Beter monteren
https://devideomakers.nl/video-bewerken-5-videos-waarvan-je-beter-gaat-monteren
iMovie exporteren
iMovie > Share > Export Movie
.m4v (MP4)
Export as: xxx.m4v
Size to export: choose the size
Export
then rename the file extension from m4v to mp4