Conclusion
Congratulations! You just went through quite a journey with Bootstrap 4. We have covered a lot of different topics and technologies in this book. There is always more to cover, and it is always possible to go into greater depth with any of the topics covered in this book's chapters. Now that you have gone through these recipes, you should be able to build wonderful custom-made sites with Bootstrap 4.
Next Steps
Hopefully, going through this book was a positive learning experience for you. If you are interested in learning even more about Bootstrap 4, make sure that you check out the Packt website, using the search term of Bootstrap 4, or simply go to the following link: https://www.packtpub.com/all?search=bootstrap%204.
Also, you can never go wrong with going back to basics and reading the official Bootstrap documentation, currently available at https://v4-alpha.getbootstrap.com/getting-started/introduction/.