I am a big fan of his books and probably have studied them more than any other author's.
Reassess Your Chess

I've got the 4th edition of Reassess Your Chess, and I find it very useful because it covers a lot of ground, and helped me to identify weaknesses in my game, and/or confirm some that I had already identified myself, which I need to work on.

I've got the workbook, too, I think it's connected to the 3rd edition. I've been meaning to read it. This is a part of my chess training that I'm feeling that I've neglecting quite a bit. Playing over games, analysing my own games, working on tactics, middlegame structures, endgames etc., all that I do (although at irregular intervals because of work commitments), but what I don't do is these types of books where you get a position, and you're asked questions and/or asked to identify the most promising continuation or evaluate the position and explain why White or Black is better, and/or to suggest a suitable for one side. It's hard work, but it's one of those things that are extremely likely to pay off a great deal.

Dont neglect your training. That is one subliminal message that I learned from RCI btw. Steady!
If the message was subliminal how do you know you perceived it?

I read most of RYC and came to the conclusion I was better off going back to My System and Chess Praxis. Nimzovich covers the same material and in greater depth.

I started to read "How to reassess your chess (4th edition)" and set up the examples in the book two weeks ago (it is my first chess book), yet i realize now that for the time/ressources i'm able to invest in studying this book, setting up and playing through the exercises in text form (as they are presented in the printed book) is very tedious and time consuming for me.
Is there any online ressource where these exercises/study examples are stored in electronic form (like in a .pgn file), so i can simply load these files into my editor and play and analyze the examples on my computer?
and if not for "Reassess Your Chess", is this the case for any other chess book you can recommend for me to learn from? (next to the learning section here on chess.com)
thank you!

The Forward Chess and Chess Studio apps allow you to play your own moves in any of their positions and use the engine.
The Everyman Chess Viewer app has an engine, but doesn’t allow you to play your own moves.

@dannyhume fantastic, thanks a lot! this makes my (quarantine) day!
Any time ... Overall, I think the Forward Chess app is the best, offering the largest selection from multiple publishers and constantly adding more. Again, I can't emphasize how great it is to be able to click on a diagrammed position in a book and then experiment with my own questionable moves, and then see quickly why those moves are wrong with the help of the engine (real patzer/low-level moves that advanced level authors would never dream of including in their limited number of pages). Best of luck.
What are your thoughts? Have you read it? What is the fastest way you have found to improve?