This guide assumes that you have a basic working knowledge of Racket and functional programming. The Racket Guide is sufficient for the former, and How to Design Programs, 2nd edition is good for the latter.
Most topics have have exercises that reinforce and expand on their lessons. Try to do every exercise. When an exercise has a linked solution page, use it to check your solution; the solution pages sometimes have important comments that aren’t repeated in the main text.
Difficult exercises are marked with one or more stars (★); they may require extra thought and care. It is okay to skip these and revisit them later, but sometimes I use an exercise in one section as the basis of a worked example in a later section, so you may encounter solution “spoilers.”