This book is completely free for you to read online and will be so forever. There will be no ads, no tracking and no crypto mining in the browser.
When I some day finish the book and decide to release it in other formats I may charge for them, but the web version will always be free. If you find the book interesting and want to show appreciation the best way is to share it with others.
Donations is a perfect use for cryptocurrencies
You can also send donations from anywhere in the world nearly instantly with small fees and no possibility of censorship. This isn’t possible with anything else.
If you want you can try it out (click to show address and QR code):