The introduction tells you to clone the repository to get access to the exercises. However, if you do this, the paths described in the exercises do not match the folder layout, as the exercises assume the folder layout of the generated exercises zip from the main page of the website.
For example, for Exercise 2.3.1, it says to follow the instructions of exercises/2-foundations-of-rust/3-advanced-syntax/1-error-propagation/src/main.rs. However, the exercise is actually located in content/mods/A-foundations/topics/optionals-errors/exercises/error-propagation/src/main.rs in the cloned repository. And similarly for the other exercises.