I just remembered the poly network heist, one of the biggest heist in the history.
Is there also a possibility BTC can be hacked?
If it is, I bet every currency will start to declined.
How safety BTC security for you?
Want to know veterans answers.

No. I don't' think so, it is highly unlikely to happen. Bitcoin is most decentralized and secure crypto currency, there is no incident of hacking attack on Bitcoin network since I started working in crypto back in 2017, though i heard lot of media reports of exchanges being hacked including Binance. It is considered most hack proof Block chain because it is network is constantly reviewed by entire network. thus, attacks on block chain are very unlikely. The wallets where crypto currencies are held are still vulnerable to attacks.