Build up your Chess 1, The Fundamentals

This book ist the first of a superb series of training books. I used it as my main training tool last year and ever since then I really feel like I improve. I am myself around 1800 Fide just for reference and I would absolutely reccommend to start with this book even if you are well above the rating range. The book is a mix of Text and workbook but I would say it is mainly a workbook and you should really put in the effort into the puzzles but it is worth it.