Welcome, this site will give you all the basic info of the Myer-Briggs Type Indicator or, the mbti.
If you don't know anything about the mbti I suggest you read it in order. That means you start at the top of the list (Which would be letter meanings) and click on that. Then expand it and start at the top of that list (Which would be E vs I) and continue downward. Do this the whole way down. I mean, you can read it out of order but I do have some things that are explained in one section that are mentioned in another so it might be a bit confusing.