some tips for beginner anatomy and some free resources?

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So I am going to take the training to draw seriously, I can say that I am better than the average but I still lack, I want to learn about anatomy and muscles in a professional way, I will take the head first the muscles of the neck and shoulders, but I really do not find many resources on this.

Do you know a place or a book where you can learn well from this? I am also interested in the anatomy of animals.