Reset SA Password in Sql Server 2012

Step 1:-
Change SQL SA password from a command prompt

Go to the command prompt of the server and type in command prompt osql –L
C:\Users\Administrator>osql -L

Servers:
localhost

Step 2:-
Copy full name of SQL Server and type: OSQL -S <insert_servername_here> -E
C:\Users\Administrator>osql -S localhost -E

Step 3:-
Execute the following query: sp_password NULL, ‘<insert_new_password_here>’, ‘sa’
1> sp_password NULL, ‘,pjam#’,’sa’
2> GO

Done, the sa password has been reset.