Welcome @massola! Steemit is awesome and a great experience. Since you are into math and computersciences, I would recommend you to check out the SteemSTEM tag and community. If you ever intend to write anything about math or computerscience this is a great tag for you to use! For now, I would recommend you to just browse around steemit and check out some people´s posts and blogs, leave a comment, and upvote and meet people. There are some great folks out there! I hope you have a good start. Let me know if you have questions or want some tips. Cheers @lesshorrible!