Do you know that feeling when you find a tool that you need right at the time you need it? This happened to me when I discovered Scala Exercises. I already knew Scala, but was looking for examples of usage of functional programming libraries like cats or doobie, shapeless for type level programming.
Scala Exercises are like interactive documentation with lots of examples, where you can directly test your intuitions and understanding of the library.
There is no need to setup anything locally, everything happens on the internet, so starting with it is immediate.
Have a look at Scala Exercises. You may also be interested in checking out the website of the authors 47 degrees. They are very active in Scala community and it is worth checking their latest activity.