Hello everyone, I would like to ask you how to become a stable profit trader, what aspects should be learned from it, I have read some books, such as price behavior, but still at a loss in the real market

The market is a friend of everyone also a friend to none. We learn everything that will make us competent in the market, know our values and how to simply emphasized on them. Becoming a stable profit trader in the market, it will more complex strategies and principles because that's really a tough call if you know what I mean. You're going too far with the whole thing, it's simple and important to firstly understand the market. Know the basis of the market, before concluding with actions involved.
You do by the books? Not efficient enough for anyone to spark interest in these books. The market is not theoretical but practical and this is essentially noticeable with mere trading in the market.