Im new and i do not know how to make my moves

Hi everyone, so i just started getting to this crypto market by downloading binance and i really need some tips for when to invest, when to sell or anything like this that would help a new member who doesn’t know. Because i see people having big profits when im out here, i invested for example in luna and it just went 0 or some like GAL that also went down, i feel like im just making random moves based on nothing or just how i feel about it lmao. So anything would be so welcome, thank you!!