Thanks for your comment! About the unofficial link, I would encourage you to talk with the authors and ask for a special discount if you don't have the money. I shared the official link because I really appreciate the author's work and I wanted to support them.
Nowadays I used to do the creative part and the "mechanic" part at the same time, separating by this way and validating before start to coding certainly will help me a lot. Thanks for the tips!
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