I have been creating pixel art for several years and compiled all of my knowledge into this book.
Can you show some examples of your work from those several years of experience?
"My" knowledge? To my eyes that reads a bit... pretentious and like you are claiming to have been the originator of that knowledge. The screenshot of the page you posted contains terminology that you obviously did not invent (since you are only 21 years old (says so on your homepage) and some of the terminology has been around longer than that), so you might wish to rephrase that into "compiled everything I have learned from freely available online resources and experience into this book".
Is there any original content in your book, any tricks you invented yourself, any conclusions you drew on your own from your several years of pixelling experience? Going by the list of contents in your opening post it seems it does not cover anything one can not learn for free by reading all the well known and established online resources on the topic of pixel art (e.g. this board).
Yes you are right, but that part is focusing on shading correctly, I figured it wasn't necessary.
If that part is about shading correctly... should it not then be... well... shaded correctly?
Disclaimer: I am not saying you are being intentionally dishonest and you deserve credit for doing the work of compiling all the knowledge and formatting/bundleing it up for convenience but I do not think anyone who wants to learn about pixel art needs to buy or read your book. All the information is already out (t)here,
for free and it would not seem right if you were to profit from it while letting others think it is "your" knowledge or the result of "your" experience/research/observation.
On the topic of capitalism: The buggy thing about it is, it is tough(maybe even impossible) to avoid having to sell ones lifetime for money in some way, if one wants to survive as a "functioning" member of society. However... taking free stuff and putting a price tag on it to make a profit seems like a bad thing to do if one cares about reputation.