Regarding interactive training resources, there are other good resources which are partially free (or limited) and partially payable content: - https://chesste

Regarding interactive training resources, there are other good resources which are partially free (or limited) and partially payable content: - https://chesstempo.com/ https://chesstempo.com/ has a great collection of chess puzzles - https://www.chessable.com https://www.chessable.com is specialized on interactive training. They have may free courses and combine what a classical book (text plus moves) would have done with memorization tools (for openings, tactics etc)