How to delete multiple photos

This technique works when selecting multiple items in the Mac Finder and also most other apps where file management is available.

Select the first photo, then hold down the Command key (⌘) and click any other photos you wish to delete. Then press the Delete key.

If the photos are adjacent, you can click the first file you wish to select, then, holding the Shift key, click the last photo you wish to select and then press the Delete key.

Please see: How to select multiple files on Mac - howtogeek.com

For future questions about using the Mac, you may wish to bookmark this website:

macOS User Guide - Apple Support