Take a free, open-source Big Five personality test. Learn to know your personality traits and compare yourself with your partner, colleagues, friends or family.
Just wanted to highlight this project because I've had to take many personality tests for school and work and things, and this is the most accurate one I've seen, and the only one where I feel I'm actually learning about myself from the results.
So if you need a personality test for any reason this one's pretty good.
MB is bullshit, the big five is the one mostly used by researchers. Altho as it is psychology, you shouldnt expect 100% on validity or other indicators