Having a project to work on is a great way to learn in a focused and targeted way. You have a specific goal in mind after all.
What are you looking for? Making a game is much more than coding. So I am wondering if it will be too much for you to handle, and it'll just become unfocused.
If you have or can make a plan of something reasonable you want to do, that's fine. If you want to focus on coding, maybe something simpler would be more useful?That being said, there's probably Unity resources you could use available as well.
If you want to learn Unity, starting with the official documentation/introduction is a great way to do so.