Random access and changed password email

Few weeks back I had a email from Apple telling me that my account was being tried to logon to from location they don’t recognise “China”. And they have locked down my account. Today I got email “Your password has successfully Reset” where as I never did changed. It had a link for me to go to “Resolution Centre” if it wasn’t me. I am bit confused on if it’s a phishing email or really from Apple? And what does it mean “Password Successfully Reset”