To all adults, what advices would you have for a newly turned 18 year old girl.

Hi i turned 18 just last month, and want to take advices from all the adults out there to navigate the next phase of my life better. Right now, I have not even tried smoking and drinking yet, and not been in any serious relationships. Just navigating my life as a college junior and would love advices on all spheres of life ❣️. Also, I will remove this post within 6 hours if mods find it not specific enough. Thanks for reading this, and please say something you think might be helpful for me. Please don't hold back and say everything you will say to your little sister. 🤗