A chess book is not a text but a set of exercises dressed as a text. When you read «White plays Nf5 with a strong attack» and nod along, nothing is left behind: you agreed with someone else's conclusion without finding anything yourself.
Easy to verify: close the book a week later and try to recall one idea from the chapter. Usually not one comes back.
The rule of active reading
Before you read the author's move, stop and decide what you would play. Wrong? Work out why. That moment of mismatch is the learning; everything else in the book is packaging around it.
An old argument, and the right answer depends on your level and on the type of book.
The main reason books get abandoned around page twenty is pages packed solid with brackets and sub-lines.
One more thing about prose: in a good book the words matter more than the variations. «The knight on d5 is stronger than the bishop because no pawn can ever chase it away» is worth more than twenty moves of calculation.
Matching the level matters more than matching the author. A book beyond your strength delivers nothing except a sense of inadequacy.
A separate word on opening books: they go out of date, they take effort, and for an amateur they are close to useless while pieces are still being dropped in the middlegame.
Above all, use what you read. A chapter on weak squares followed by three games spent hunting for weak squares works. The same chapter without games does not work at all.
Three formats solve three different problems, so arguing about which is best is pointless.
Hence the working mix: puzzles every day, a book for half an hour a few times a week, video when you want to meet a new subject without effort.
Usually because they are read like ordinary text: you agree with the author's move and read on. The learning happens when you first decide the move yourself, then compare with the book and work out the difference.
A beginner does, otherwise the position will not stay in mind. After that a middle mode helps: push the main line on a board and calculate side variations in your head. Reading entirely in your head is an advanced skill, close to blindfold play.
On the first pass skip them entirely and read only the main line to grasp the idea. Return to the variations on a second pass, and only where you were wrong or lost the thread. Memorising lines is pointless - what matters is the idea.
About half an hour: active reading tires you faster than ordinary reading, and beyond that it becomes page-turning. Five pages with a board are worth more than fifty read on a commute, and one book at a time beats three in parallel.
They do different jobs. Puzzles build the skill and are needed daily; video introduces a topic quickly but creates an illusion of understanding; a book is the only format that makes you think for yourself at your own pace. Combine all three.
The Vibe Chess app is built for an evening over the board, not for online play: it keeps the sign-up list, the pairings and the table while you deal with people and the venue. All of it free.
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Related - chess composition, organizing a tournament, tournament FAQ.