Phisihing was an act to obtain a person's personal information having an evil intent. This often happens in the digital world where we are using usernames, passwords, credit card details, bank account details and many more that usually involved money. So basically it was an act to get an access to your personal account.
Was steemit safe from Phishing? well I really do believe that steemit was not safe in this act. There were case where users received some transferred SBD or STEEM with url that will lead you to a page very similar to steemconnect. Once a user entered his/her password to this site, his/her password will automatically saved into the database of that website and Viola ! ! ! they got your account already. Better be careful in opening some untrusted websites.
Another was by using another computers some computers have keyloggeres which enables them to all the characters that was typed in the computer. Better be careful also in opening steemit account to internet shops as they might steal your precious account