Do not invest all in single coin, invest in multiple coins always, investing in single coin can be a risk.
Do listen to others but invest only after doing your own research. Good luck
Actually investing does not have to be in a lot of coins as well, although it is still better than in just one coin, in my opinion investing in two or three coins is enough to make a profit and even then it must always be chosen in the top five in the ranking, meaning choosing three out of five investing is a very good thing I think, in this case I am talking about BTC, ETH and BNB which are now in the top 5 in the ranking.