Books can bring people to a higher knowledge level, rather than games.

"Knowledge level" is an unusual thing to say. "Level of knowledge" would be more natural. But I think it's acceptable.

To Rreach higher levels, it means's necessary to take on more difficultie tasks and breaking through the comfort zone is needed.

Slightly guessing at your meaning here. "take more difficulties" doesn't make sense.

The rReading a book is a slow and boring journey.

Or you might say "the reading of a book". "Reading is a slow and boring journey" works but sounds awkward to my ear.

"Boring" is rather a strong word to use here, and the sentence sort of implies that reading is never fun or enjoyable, which may not be what you intend. Perhaps hedge: "Reading a book is slow, and can be boring."

On the contraryother hand, watching videos, playing games, listening to music and chatting are all easy-to-useily experiencesd.

"On the contrary" is something you say when you want to *contradict* what was previously said, not just make a comparison. I might say "Reading books is not boring! On the contrary, it's fun and rewarding." It's also a rather bookish term.

"But" would be the simplest word to use here but I think you want to be illustrative, so "on the other hand" would be good.

We say "easy-to-use" about nouns that we interact with. A phone is easy to use, or a website. It doesn't make sense to say chatting is easy to use, or that an experience is easy to use.

Most of the content is within the knowledge threshold of ordinary users, either inat the user's level or lower than the user's level.

A level is something you are on or at, not in.

Again, this is an idiosyncratic way to say what you mean. Something like "Most of the content does not challenge ordinary users, and is either at their level of knowledge or below it." would be more natural.

For users, there is no obstacle in terms of acceptance, and even the user is superiorto understanding the content, and they may even find it too these content, which can also produce the guilt ofeasy. Sometimes this can make them feel guilty about wasting time.

A messy sentence. I've guessed at what you mean.

So, back to the essence of the problem, the. There is a difference in levels between books and games are different.

Or "the levels of books and games are different". When you say "between them" you are focusing on the space that separates them. Think of a building - the levels between level 1 and level 5 are levels 2, 3 and 4. You wouldn't say 2, 3 and 4 are different. I suggest "a difference in levels" because it means "there are enough levels between 1 and 5 to make a difference".

The more knowledgeableadvanced a book is, the higher its level is.

Really, only animate things are knowledgeable. You could say "the more knowledge is contained within a book, the higher its level is".

TheA lack of knowledge and ability leads to thean inability to read books.

"The" lack - what lack? You're pointing towards a specific thing, but you appear to mean in general, something that someone might have.

"For these learners, the lack of knowledge leads to the inability" - this would be okay.
"These days, the lack of knowledge about written language leads to the inability to read books" - also fine.