Hello, friend!
I will not talk about books, there is already a lot of information about this everywhere, you just have to make a choice.
I would advise you to read this section.
To improve your game ....https://www.cardschat.com/poker-strategy.php
here everything is described in the most accessible language and the best tips are selected.
even on the forum recently appeared a new training e-book.
https://www.cardschat.com/forum/learning-poker-57/cardschat-a-new-ebook-training-course-455641/
I think you'll have enough information to start with.
good luck at the tables!