Alright, great question there
First of all, i would suggest you to turn on 2FA
When people say about exchanges getting hacked, it is usually exchanges wallet were compromised due to security breach, exchanges normaly uses cold/hot wallet, multisig wallet, so it is very hard for their digital wallet to get compromised unless others has access to it
But it would not very likely for exchanges which run for years to get hack as i believe they put lots of their funds on security operation
In the other case, how likely are you going to get hacked on your pc? well the only thing you need to worry is
1) Always check if you are on the right site
2) Always double confirm the address you sent/receive
3) Never download any suspicious link
The only way for your account to get hacked on your own pc is usully by keylogging and phishing. Therefore, get 2FA