Noobie Investor via /r/wallstreetbets #stocks #wallstreetbets #investing

Hi, I’m a 18 year old college student who is trying to get ahead of the game and find different streams of income. I have a job, a side hustle, 400 invested in long term stocks, and just recently got invested in day trading. Can anyone give me some tips and just general information I shouls know. I joined a reddit and I saw people buying stocks for the highest price, why do they deviate from the strategy of buying low and selling high? Any help is welcome, thank you.