Imovie IMac big sur

It's not a book exactly, but here a link to an online Help link that has a great search feature where you can search by topic or search word:

https://help.apple.com/imovie/mac/10.1/

Photo clips and video clips are pretty much used the same way. You add them to the timeline and then add your transitions, titles. overlays, and other effects. The main difference is that Photos have a duration (the time that the photos is displayed) whereas video clips have frames per second. So, you can change the speed of a video and the duration of a photo.

-- Rich

You need to upgrade your iPhoto library into Photos. If you are running Big Sur then I believe that you already have Photos 6 on your Mac.

Take a look at this thread that discusses upgrading your iPhoto library into Photos:

https://discussions.apple.com/thread/252527052

-- Rich

Here's a link to a good online help feature that has a good search function where you can search by keyword or topic:

https://help.apple.com/imovie/mac/10.1/

-- Rich