I do both.
Half of my money goes to investments, and rest of my money is for savings.
This way I feel it's the best for me.
That's a pretty nice decision to deal with your money IMO. In case you lose with your investments you'll have your saving at least. I personally never invest because I'm afraid with my luck I'll choose the wrong company to invest in.
Yes we should always be careful with our money on when and who to invest it with as we all know that there are many scam sites out there,i too doesnt invest much and only put a few amounts into trading to try it out.
Yeah if any site promises that they will multiply your coins in few hours, then just stay away from it as its surely gonna be ponzi.