New ask Hacker News story: Ask HN: What is something important I should start doing in my 20s?

Ask HN: What is something important I should start doing in my 20s?
8 by saaspirant | 10 comments on Hacker News.
Something I should do in my 20's which will have good impact on my future. Also things I should NOT to do in my 20's. I am looking for all types of stuff - personal, professional, etc. Thanks