Adobe’s Photoshop web app is now free to use in Canada. There’s access without an account here if you upload an image to start with. Then you can take a tour to introduce “the beta’s interface, collaboration features, and limited editing functionality.”
Photoshop has an enviable reputation. Even on this stripped-down version, there is a bit of a learning curve.
Depending on your needs you may prefer to stick with what you know. Lately, I’ve been using Photopea.