BOOTH is a service provided by Pixiv Inc. well-known for Pixiv that allows anyone to easily open an online store and make purchases.
You can find illustrations, photos, accessories, music, books, indie games and many other products made by creators!
In recent years, more and more Japanese game developers have been using BOOTH to sell technical information and tips on various software in PDF format and there’re nearly 4,000 technical books available for sale alone. For example, a search for “Substance Designer” yields 66 results. In there you’ll find some great tutorial books to get you started learn!
Since Japanese companies don’t like their employees to work on the side, most developers open their stores under their handles. And their main place of announcement for selling goods is Twitter.
Nowadays in Japan, many developers are not getting paid enough and more and more people are interested in side jobs, I am one of them. I hope their lives will be enriched.