My friends email was hacked

My friends email was hacked.  Do i need to change my email?  

My friend email has been blocked and marked as spam.

If your friend's email was hacked, it doesn't necessarily mean that you need to change your email address. However, there are some important steps you should take :
Review your own email account for any unusual activity, such as unrecognized login attempts or suspicious emails in your sent or received folders.
Enable two-factor authentication 
Change your password.
Be cautious when receiving emails from your friend's compromised account. If you receive any suspicious emails, especially those requesting personal information or financial help, verify the sender's identity through another communication method before taking any action.

Guide me on how can i secure my business emails from hackers.

I don't think you need to worry about that. it it concerns you, you could change your password.

[Edit: Removed hyperlink to a potentially malicious page to conform with the Participation Guidelines and Terms of Service]