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?
Hah. It's normal that you feel a bit paranoid since we are talking about money here.
2 Factor Authentication does help your bitcoin wallet become safe. But take note that it doesn't mean that it makes it invulnerable from thieves. But hey, an extra layer of security is definitely a big help.
What wallet are you using if you dont mind us asking?
P.S. Good for you for trying out Bitcoin!
If there is still a possibility to be hacked why online wallet advise me to add 2fa?
Yes, of course.
Even with 2FA, there is a possibility of you getting hacked.
Anything is possible. Your mobile phone might be compromised alongside with your login details, email address, and your PC. These things rarely happen but do happen. It's like collisions on the bitcoin network with private keys can be found but are extremely rare, so rare that it's better to solo mine than try to find private keys that contain balance in them.
By enabling 2fa you are essentially reducing the risk of you getting hacked. Not eliminating it, but reducing it. It's like insurance.