This is the best slideshow maker for 2020. Animoto is a perfect video slideshow maker that works on any platform. It has lots of pre-done templates that are VERY easy to use. You can mix photos and videos that you either upload yourself or from Google Drive, Dropbox etc. You can add your own music, or choose music from their library.
This is a VERY quick and easy way to make slideshows for any event.
If you’re on a Mac, you’ve already got iMovie. Check out our video on making video slideshows with iMovie: https://www.youtube.com/watch?v=KaQ7t5PZERs