How can i undertsand from books

I have some chess books and i enjoy reading them but when it comes to practice i forget and maybe even lose games,its hard to remember what i read,are there any tips?

First, it's about practice. The more you practice, the more you can remember and play moves. I can't recall the name but I read about some platform that allows playing quizzes and other practical tools to practice moves that you learn and thus, remember in the long term.

Chess books are for business and not meant to teach chess in that sense and you rarely come across anyone who has become very good at chess with books. Chess coaches can make all the good difference though!

You can supplement your knowledge gained from books by solving puzzles to familiarize yourself with different chess patterns that you can apply in your game. Also, Play as many games as you can.

1. Assuming that you feel the lesson from the book you’re struggling with is unique and valuable, re-read the book one more time. Kasparov’s last series of books tend to do this to anyone less than GM level. 
2. Pick up a different title with the same/similar lesson/motiff and see if you remember the presentation by a different author/teacher/instructor. Thank capitalism for this option.

Not all books are great. You should look for the classics and work your way from those. If you search this forum for book recommendations, you'll find several older threads.

There are several categories of books. Manuals can teach you a bit about everything and some can be very concise too. Collections of master games can teach you a lot, especially if the commentary is good. There are books covering specific aspects of the game, which can also be very educational.

I’m not sure what books you have and what aspect(s) of the game they are on.However in general there are several things to keep in mind when reading chess books that focus on the middlegame,and endgame(we will get to opening books soon).First of all results are often not seen immediately, but overtime the skills and techniques will seep in and get integrated with your play especially if your a intuitive player.Second of all,it goes without saying that reading a chess book does not guarantee a win in every,or even most games at your level,however as people mentioned in this forum as you play more,your book knowledge will start to show and you will certainly improve.Finally as others have mentioned not all chess books are beneficial for all players.As for the opening,there are books that require memorization,books that teach,ideas and concepts,and books that have a mixture of both.If you are having trouble remembering a opening you have several options for getting the opening ingrained in your head.One such method is to play it many times against bots(or even a specific bot if it switches around the moves it plays against your opening)until you know it inside and out,feel comfortable playing it,and find yourself in positions you like and often win from.Another method is to input the lines into a app,or website such as Chess Prep that are repertoire trainers that use repetition as the way to make the user get there openings down pat.If you send me a list of the books you read,perhaps I could give you a more personalized response.