In this book, we covered a lot of theory and practice.
We discussed a wide variety of fundamental machine learning algorithms, be it supervised or unsupervised, illustrated best practices as well as ways to avoid common pitfalls, and we touched upon a variety of commands and packages for data analysis, machine learning, and visualization.
If you made it this far, you have already made a big step toward machine learning mastery. From here on out, I am confident you will do just fine on your own.
All that's left to say is farewell! I hope you enjoyed the ride; I certainly did.