In order to invest wisely, you need to do a ton of research on whatever you're buying in. And there's one important thing to keep in mind - don't bet everything on a single project/coin. Diversify your portfolio. Hope for the best, but prepare for the worst.
prepare our self with enough of knowledge and observation about the thing that we want to invest is very helpfull to us.and as you said the most safety thing is split our portofolio to be several coins or tokens.