Keep a journal of your questions for this class. You will save time by telling us the question and details about your device or your approach. Sometimes describing a problem in writing helps you solve it. Or your notes will be helpful when you pull the nuclear option and contact Apple Support.
The apps to begin with are listed on our Apps page. Use these links to get the specific app used by others in this class: ProCamera, Slow Shutter, Snapseed (free), Metapho and Touch Retouch.
Review the Cheatsheet page for the apps mentioned (some) and the features available for the apps used by our studio participants.