While human beings like to think that we're the most advanced species that ever existed, the fact remains that relatively, most are actually rather stupid. I'm sure you could come up with abundant supporting evidence of your own for that case.
While some go to school to "get smart," or others use brain training apps on their smartphones, here is one straightforward route to massively increasing your intelligence:
Develop an understanding of COGNITIVE BIAS.
I first heard Tai Lopez talk about the importance of cognitive bias back when he more about reading a book a day than being a flashy social media star with a garage full of cars and Instagram full of supermodels, though it took a while longer to dig in and really get what he was talking about. Though holy shit, was he ever right.
This isn't a direct lesson on what cognitive bias is, how they work, and the numerous forms they take. That's an individual journey.
However, may this be the impetus for others here to begin that journey for their own.
There is no way of overstating what a huge impact cognitive bias plays in our lives - and how much we dumb ourselves down through their playing out, unconsciously.
Want to get exponentially smarter? Learn the in's and out's of cognitive biases.
But don't stop there.
Pick yourself apart continually to assess how you play them out regularly.
Being able to identify them externally is one matter. But to see how you limit yourself through them... oh boy, that's a whole other matter.
Be warned: this is an exercise that is not for the faint of heart. Nor is it a quick one.
Diving down this rabbit hole requires a willingness to kill off layers of your ego you didn't know exists, almost self-masochistically tearing yourself down to rid your psyche of the weeds and bullshit that've put ceilings on the levels of intelligence you can rise to.
There's not a whole lot more to say on this matter, other than: if you're into personal development at all, this may be one of the most impactful endeavors you partake in.
You will not come out the same on the other side.
Some starter resources:
Cognitive bias cheat sheet
5 Ways Your Brain Plays Tricks On You
List of cognitive biases
Lessons From Copernicus: How To Develop New Perspectives
May ignorance be steadily banished, giving way to consciousness, stupidity dying to give birth to increasing wisdom, and the plateaus of our errors serve as the springboards to higher levels of intelligence through this evolution.