if you are a new, it is a very dangerous business and I do not like short-term business.
You have to be some background in this field, do the some research. If you have some news, it will be better.
I like long-term investments. If I get some significant benefits, then I sell it. but some times it also failed , for example ETH right now 4X or more in down compared to Jan/DEC usd value. it may gain go up but how long it will take! that is the bad situation with long holding.