So you might think that just having a strong password is secure enough. That's incorrect. Because sometimes the site you sign up in gets hacked, and the database gets leaked. That's how most of the big celebrities and users on websites are getting hacked now a days.

TO CHECK IF YOU WERE HACKED;
Sign up on https://www.leakedsource.com
Buy a $2 subscription which will last for a day.
IF YOU DON'T WANT TO BUY ONE, ASK ME AND I'LL LOOK UP FOR YOU.

Now, you need to do two things.
1: Look up your username. 
It'll come with something like (if found)
Username:
Password:
Hash/salt:
Email:
Phone/extra info:

If you find a password that's outdated, don't be so happy. The next step is;
You need to search up the email that was found with the results, because sometimes the password is outdated but that same email will be in recent database leaks which is where many people go wrong. So look up the email, and see what else comes up.

SECURE YOUR SELF.