Help me to start

Hello. I'm 19M, gonna be 20 soon. I used to be an intraday trader at my 16 and ended up with losing little of my money (though I didn't put much into it. Was about 2k). Now, I wanna start the things again but as an investor this time. I know I need to understand and learn the markets, but I don't know what I should. What would you do if you were me at this age being a CS student. It will be very helpful for me. Thank you. Edit: mai isliye trading start kiya, kyu ki mujhe finances mein interest thi naki coz I'm bad at academics