I have been doing the rustlings exercises (which are basically exercises to fix errors on various topics) - they are just the right size to keep you engaged and continuing because they reward you with success. Also its very easy to leave it anywhere and resume exactly the same point or go back to an old exercise and retry it. Plus because its just code organized in a directory, you can leverage all the feature of your favorite IDE. Highly recommended.
https://github.com/rust-lang/rustlings
I spent the last two weeks going through it and so far the experience has been great. There's a quiz at the end of most chapters.