Step 1. Optimize hardware. Sleep, exercise, reduce stress.

Step 2. Optimize software. Your brain is a neural network that needs reinforcement learning to learn anything. Be open minded, adopt a mental framework of picking up new things and doing them, iteratively figuring things out. You need to leverage the hedonistic aspects of your human brain - i.e you need to get some "reward" from doing activities that improve you knowledge, which mean you have to tailor your activities towards that. For example, if you want to get good at circuits, you should aim to build widgets that improve your life somehow, instead of random hobby projects.

Thats pretty much it. The issue that most people have is you often have to have the first part of step 2 to do step 1, and if you don't do step 1, you lack the capability to execute step 2. How to break the loop is different for every person, but psychedelics seem to be of good use.

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According to current psychological evidence you cannot become more intelligent. Intelligence is fixed. You can, however, study with great focus and intensity with a goal of increasing your intelligence, but the results are tiny and extremely temporary.

Instead of becoming more intelligent you can always become more educated. The results of increased education vary significantly by person and may result in near-permanent contributions. The goals of increased education are increased skills, increased decision making capacity, and increased risk appreciation.

Do you know the feeling you get in the pit of your stomach when you're wrong?

That's not what it feels like.... that's what it feels like after you learn you were wrong. There's no difference in feeling between being right or wrong. So, if you want to be right more often (a proxy for being "smarter), I suggest the following.

Write down predictions somewhere, along with your view of the world, things you're worried about, etc. Keep it private, but be as descriptive as you can to yourself, as time goes on, you can then retrospectively see where your biases and fears have distorted your thinking, and find clues to the things you were right about, but too afraid to follow up on. Over time, you should gain both perspective and wisdom, and perhaps a bit of "smarter" as well.

"Perspective is worth 80 IQ points"

By trying to obtain a grander perspective and awareness of the scale and scope of the universe, one sees many limitations of our own species :)

Perhaps, one such limitation is an inability to define what really is meant by "intelligence".

Relevant example - inventing the atomic bomb (result of intelligence), using the atomic bomb (result of same "intelligence"?). There are many such examples, showcasing how confused/irrational members of the species can get.

Maybe it is just wiser to sidestep the question altogether, and ask a better question, something that can be answered.

In my opinion, the problem stems from trying to get an extremely generic definition capturing performance in all sorts of disparate behaviors and activities.

The people you think are very intelligent are usually not outside the standard deviation, and if they are then not by much.

What the top performers in all fields have in common is that they made a decision at some point in their lives to truly go all in on being the best at a particular thing, and that takes sacrifices that you probably don't want to make, and there's nothing wrong with that. There is no shame in not being a high performer and just being generally okay at everything.

This is mostly ignoring the true outliers with very high IQs, but that is such a huge anomaly statistically that there is no use even discussing it. It is not the norm among even the most successful entrepreneurs or fortune 500 CEOs or endowed chairs of Computer Science.

Be humble. Have a willingness to learn new perspectives and accept you don't know everything.

Knowledge is all you need.

With having knowledge in different domains, one should learn to interconnect Domains in a chain-of-thought.

This isn't easy. But can be trained. Just like with different languages. You may be able to speak several languages fluently. But to speak with the grammer of the first, using the words of the second and "thinking" in third - fluently - isn't as easy, if the third isn't your mother language. But this can be trained. I needed like 2 months with each day talking am the phone to reach that ability. So. I'm smart now :)

The same applies to technical knowledge, that needs to be interconnected with economic knowledge. One's need to train train train.

Smartness is a multi-dimensional attribute. For example, a smart motor mechanic and a smart software developer are both smart in their respective fields, but neither is likely to be seen as smart in the other person's domain.

As a very broad brush generalisation, you become smart by learning from those who are smarter than you in your chosen field. You could accomplish that by reading, seriously studying, being mentored and most critically practising your "craft".

If you simply just learn a huge pile of facts and are able to regurgitate them at will, then most people will think you are a "smart alec", which is probably not what you want to be known as.

Some people will argue that you can’t because IQ is relatively fixed according to a lot of experts. However, while you may not be able to increase your IQ score by much, you can certainly go acquire more education. Structured learning across a broad range of topics is good way to increase the depth of your understanding of the world around you, and even if that can’t be captured in an IQ score that’s a smart thing to do.

Sleep 8 hours a night, manage your stress, exercise regularly, avoid alcohol, and eat healthy.

Won't make you smarter, but will bring out the smarts you were born with.