We've gone over quite a bit in this book, but there is a lot more to Unreal Engine than what was covered here. As you get comfortable with the editor and the process of making games, you will definitely want to expand your knowledge. There are a lot of resources available for you. A good starting point is Epic's documentation for the engine, which can be found at https://docs.unrealengine.com/en-us/, as well as the forums, where you can interact with the community, ask questions, and show off your work, at: https://forums.unrealengine.com/.
In addition, there are plenty of tutorials on YouTube and various blogs that cover every topic imaginable.
Have fun with Unreal Engine, and good luck with your project! Thank you for reading this book, and I sincerely hope it helped.