I became a vouch copy from @royals.
Honestly when I read all the vouches I can only agree with them. This ebook made me feel not only a coder, also I fully understood what I'm doing and why.
(Remember, I have absolutely no experience with C#!)
THIS IS ABSOLUTELY HQ
I recommend every single pleb that wants to have a clue how checkers are made to buy this.
With this you will be experienced enough to do your own basic checker afterwards.