|Chess is 99% tactics! This well-known maxim may sound strange but is really just an exaggerated basic truth: if you want to win more games, nothing works better than training combinations. Solving many tactical puzzles is what makes the difference for beginners and casual players.|
There are two types of books on tactics, those that introduce the concepts followed by a some examples, and workbooks that contain numerous exercises. Chess masters Franco Masetti and Roberto Messa have done both: they explain the basic tactical ideas AND provide an enormous amount of exercises for each different theme.
1001 Chess Exercises for Beginners is a great first tactics book. It helps you in identifying weak spots in the position of your opponent, in recognizing patterns of combinations, and in visualizing tricks.