>>13277737being smart in IQ terms is not really important and you cannot really train to be smart. It's basically how fast you learn stuff, which you can also get better at by just having an open mind. A way better option is to get as much experience as possible in life and acquire wisdom instead. Your previous experiences will help you learn new stuff quicker because you can relate them to your previous memories.
So just educate yourself in many different things, acknowledge your mistakes when you make them and learn from them.
