You can edit from the OpenStreetMap website, zoom in on an area, click Edit, then it has a nice helpful tutorial. It's very beginner friendly and easy to edit. There are also many other applications for a variety of platforms listed here https://wiki.openstreetmap.org/wiki/Editors
Contributing via StreetComplete is contributing directly to OSM, so good work. But like Interstellar said, you can just log in to openstreetmap.org, zoom in to what you want to edit, and click Edit.