A complete solution for novices and professionals alike, Polarr (Free, $2.49/month or $23.99/year to unlock all features) is a powerful photo editor with a vast array of tools for you to use, from filters and one-touch adjustments to layers and masks.
All edits are nondestructive, allowing you to revisit edited photos at any time, and you can save edits as filters to use again and again. Polarr also supports Apple Pencil so you can make adjustments that are much more precise.
If you’ve ever used photo editors like Adobe Lightroom, Polarr’s workspace will make you feel right at home. Polarr also includes a selection of tutorials to help new users learn how to perform various techniques using the app.