That's a huge topic but I would say implement a hobby project and learn by doing. Pick something you're interested in and start writing code to exercise the theoretical concepts.
A small piece of advice is to make sure you're motivated before diving in. Debugging a race condition, just as an example, can be quite involved and consume a lot of your time and energy to even reproduce.
A small piece of advice is to make sure you're motivated before diving in. Debugging a race condition, just as an example, can be quite involved and consume a lot of your time and energy to even reproduce.