Tactics exercise book
One of the best ways to improve your chess skills is to practice tactics. By going over more puzzles, it helps you recognize certain patterns that you can apply in your own games. A helpful book recommended by one of our instructors, Stella Pashyan, is "Sharpen Your Tactics: 1125 Brilliant Sacrifices, Combinations, and Studies" by A. Lein and B. Archangelsky. This book is suitable for players of any level, ranging from beginner to master. The puzzles start easy and gradually become more difficult as you continue.
To access, you can either purchase the book from Amazon by clicking the link, or you can download the free PDF version above.