Is there a website (or place here) where one can go for additional exercises on lesson topics? The ones in the lesson itself are great, but it takes more than one or two to really cement a concept and allow it to be applied.
There are sandboxes where we can play with code. Take someone’s problem that you can’t immediately solve, then work on it until you solve it, and document it. Pick problems that are above your ability so you are forced to learn in the process.