I just found out bitcoin and I chose to use online wallet but there is a fear feel that makes me often check did my bitcoin is still safe. I have read some articles there saying for me to use 2fa as additional security. is that true?
Yes, it adds a second layer of security to your wallet but it cannot be taken for face value. The two factor authorisation system itself is not hack proof and someone may get access to it too. If you are using a online wallet, this validated the computer or device which you are using.