You don't have to panic, you have to be cold and think. Ofc coins are also going down, you don't have to panic when this happen.

Be a Holder, don't sell immediatly on panic because you will lose money.

Most important thing, read about the project you want to invest in; read the whitepaper, study the roadmap, put some interest in it, not just your money. Gotta be careful on those scams projects..