In reply to Arcturus:
If you want specifically a book of tactics, and you can get it, 1001 Winning Chess Sacrifices and Combinations, by Reinfeld. If by 'tactics', you just mean strategems in general, then my own recommendation as a general beginner's book would be Introduction to Chess by Irving Chernev, but that's probably also out of print. Both old, but they worked on me. There are many newer books, of course.
Of course these days there are many online tactics testers, for instance Puzzle Rush on chess.com.
jcm