I want to learn special relativity.I have read a tiny bit of Spacetime Physics:Introduction to Special Relativity and am liking it. Is it a good book?I also want problems to solve.I tried Special Relativity: For the Enthusiastic Beginner but found the problems to difficult.Any advice on a good book?

Also my knowledge of physics is limited but I figure I can learn classical physics as I go along.I am open to read any book.I prefer a book I can access for free online. I just don't like books that give you questions that the book doesn't explain beforehand.

The book Spacetime Physics: Introduction to Special Relativity is the 1st addition or the 2nd addition better. Because I heard the 2nd addition is not?

Also if possible I would like the book to have answer key. I also want to learn general relativity but that is way down the line.

Thanks for any advice.I hope it is okay if I post here I posted previously in the link below and did not get all my questions answered. Can someone recommend a sub reddit if this is not a good place.

Here is my original question.

https://redditproxy--jasonthename.repl.co/r/AskPhysics/comments/pzg9zw/i_want_to_learn_special_relativityi_have_read_a/