A strong password is very important to maintain security. Web servers are usually more powerful and have access to greater bandwidth than your personal computer, which makes them a prime target for password crackers
You can increase the strength of your password by adding UPPER CASE, numbers, and symbol characters (@, #, $, %, etc).
Note: By default, the MySQL root password is set to a random string. You should set this to something that is very hard to guess. You do not need to remember this password unless you plan to connect manually to MySQL as the root user.