Forgot Password

If you forgot your Mac login password - Apple Support describes the applicable steps. If you can't reset your Mac login password describes what to do next. Follow them all the way through to their conclusion.

In addition, it may be wise for you to get yourself a password manager particularly if you have a number of logins and passwords that you need to manage. Personally I use 1Password, however there are many to select from. Having a tool like this is invaluable because if you are like many of us and have a lot of information to remember you need a reliable tool to help you.

X2 for 1Password