I think each of us has probably asked ourselves this question at least once. However, not everyone understands what steps need to be taken and not everyone can give a correct definition of the mind.
So, a smart person is not the one who has read a lot of books, not the one who has a lot of education, not the one who knows a lot of languages, not the one who has a lot of money - these are all just possible attributes of a smart person.
A smart person is the one who finds solutions to problems he encounters for the first time the fastest. That is, such a person most effectively uses his brain and body for his own benefit, when interacting with the environment.
For an idealized example, watch the gripping movie " Limitless ". The filmmakers clearly showed the development of an intelligent person thanks to the fictional drug NZT48.
Of course, in real life, such development is much more difficult, but it is possible if you follow a certain methodology. What this methodology consists of I will now briefly explain:
You need to be healthy, it sounds damn trite, but the essence is conveyed by the proverb "a healthy mind in a healthy body".
Imagine that your body is a car in which you need to drive from point A to point B (a journey the length of your life). So, if at the beginning of the journey you notice that something is wrong under the hood, then there is a high probability of not getting there, so you definitely need to fix everything
So, we've sorted out the body, fixed it. Next, you need to learn how to learn quickly This can only be done empirically, constantly changing your occupation. Learn to drive a car, learn to swim, play the piano, draw, read out loud, etc. Forget about "this is not my thing", "I'm not interested". The more often you change your occupation, the more "trained" your brain will be in terms of the speed of creating new neural connections.
Don't tie all your activity to making money. That is, doing only what you are paid for is a sign of limitations. Remember the words - a smart person does not live on a salary
Be social , i.e. constantly communicate with people "offline" . This is very important, I already talked about the brain growth factor ( BDNF ), which decreases in the brain during social isolation. And you don't need to think that some people don't want/don't deserve to communicate with you. Force yourself. For example, like "pick-up artists" do when they meet girls on the street. For example, I don't mind chatting with a taxi driver or any girl I liked somewhere on the subway
Persistently analyze and check all the information you receive, do not take everything as a fact just because it was reported by some "opinion leader" from the Internet, TV or YouTube. For example, the situation with covid and the war clearly showed that even the most authoritative sources are mistaken/deceived.