When doing my first certification project, my progress is not saved, it goes back any time i coming back there

when doing my first certification project, my progress is not saved, it goes back any time i coming back there

The code in the final projects is saved when you run the tests or use the Save button, it’s not saved automatically.
If you return to the page and don’t see your code, try reloading the page with Ctrl+F5 or clearing your browser data