How do I find my MacBook Pro password?
There are a couple methods to reset an admin password. Once you restart, Apple guides you to this when you fail to enter the password correctly. 


https://support.apple.com/en-us/HT202860


Also these questions cover the ground pretty thoroughly. 


Lost access to admin user account in my mac book pro
How can I get admin access to a Mac without knowing the current password?
How to hack into a deceased person&#39;s Mac that is still running?