Most Helpful Guy
Without more information with regards to what being smarter means to you in this context, and why you want to be smarter... it would seem difficult to offer detailed advice. However on a general level, I would offer the following:
I don't know if you've heard the story of Socrates and the Oracle at Delphi (and pardon me if you've have), but long ago, supposedly the Oracle at Delphi let it be known that Socrates was the wisest man in all Athens. Socrates didn't believe this and set out to disprove it. He supposedly questioned others who might be considered wise, but each seemingly laid claim to knowing things which they did not. Socrates came to the conclusion that he was indeed the wisest man in Athens, because it seemed that he alone was willing to acknowledge his own ignorance.
Being smart arguably isn't just about knowing facts or figures, but about being able to understand the world and to learn. But you can't fill a cup that's already full, and believing something that is wrong can put your further from the truth than believing nothing.
To that end, I would suggest that if one wishes to be smart, one should understand the limits of one's own knowledge, and possess a willingness to question one's own beliefs and assumptions. Understanding the difference between fact and opinion, between certainty and likelihood, between possibility and probability.
Generally speaking, you should avoid absolutist language in most cases (always, never, everyone). You should recognize that personal experience does not in many cases substitute for scientific evidence. Attempt to cleave to precision, probability and statistics.
Question your beliefs, your assumptions and the evidence on which those assumptions are based. Question other's beliefs and assumptions. Be willing to acknowledge you could be wrong, and try to proportion the strength of your belief with respect to the strength of the evidence on which that belief is based. And don't be afraid to search for answers for anything on which you are unsure.
Beyond that, learning a great deal will likely help you become smarter. Some sources / methods are likely better than others for acquiring information, but there are many books, articles and videos that might help. Without knowing more it's hard to offer relevant suggestions.
Finally, memory is important. It can take some work, but there are ways to improve memory, see something like dominque o'briens how to develop a perfect memory.
almost out of space~2
Most Helpful Girl
By learning as much as you can? depends on what you define as being "smarter" too though of course.
In my opinion, knowing lots of random facts about thousands of strange/interesting/random topics can make you smarter because sometimes you'll know something that even the brainiest people don't know. read articles and documentaries about things that interest you and things that have always made you think "hmm i wonder how that works" or "where's that place". you don't have to be a rocket scientist to be smart. You just have to not wanna be the dumbest person that has nothing to ever contribute to a conversation. you wanna see dumb... then you should see one of the girls I work with, no information goes into her brain at all... it's actually amazing how dumb she really is more than frustrating.1