Yes you can ofcourse. Play lots of longer games with selected openings (1-2 openings for black, 1-2 for white). Analyze the games after you finish them. Check where did you leave the opening book, was it an error? Note the error, don't repeat it again, and continue further.. Learning openings without playing games with it doesn't have any purpose at least for me. Since you will anyway forget most of the lines in a week.
Each opening move has some purpose, you should try to understand what it is for each move (try youtube videos for explanations). And this way when your oponnent makes the mistake in opening - you will know how to punish him and gain advantage.
My chess rating is 1420. I don't havela a chess mentor or a teacher so i training by myself. I know everybody sais that tactics improve your play but is the opening and middlegame, posetio creation that triggers my mind. I rhink that after you master middlegame game (build your posetio) and don't mess it up in the beginning then after that you should look for tactics and practise them. So the question im savina double with is can i improve by reading chess books?
I have this amazing app on my smartphone called chess book study where you download your pdf chess book and open it and that app gives you a virtual chess board where you put moves and later you can return to the beginning and replay the moves. Can i improve like this and whats the best book about opening, middlegame?
PS: i had this book which had all three parts of the game opening, middlegame , ending don't know the name.