so I got my first 40$ worth of bitcoin i noticed that the that the 40$ goes up and down. Im scared that it will go to 0$ is this possible?, Should i spend my bitcoin on a giftcard? any help please
It is not a good sign that you don't know this.
Any investment you make of anything starts with the understanding that this is a risk and you should be prepared to lose ALL THE MONEY. Never trade while fearful or hopeful. Fear and hope have no place in mathematics and lead to incorrect decisions.
Having said that, bitcoin will not go to zero. Hell, I would pay a penny for every coin in existence, so there. But let's talk about what you are doing. Bitcoin was never envisioned as an "investment". You can speculate with it, but that is not what it is. Bitcoin is money. That's all, nothing more.
A risk averse way to live off bitcoin is to buy say $500 worth and spend it when the price doubles. Then repeat the process. You will be living at a 50% discount on the items you buy. Whatever your plan, have a plan. Forget what others are doing, don't read the click-bait nonsense on the crypto news sites. Work your plan.