Ofc, strong password will save your personal stuff as well as your nerves when some1 try to hack your e-mail/acc. ToxicBiohazard told you what you should use in your password, I'll add that password shouldn't be anyhow related to you (don't use name etc). Best passwords are just long combination of some characters like J(8ke%aT97# coz it is very hard to find this password by programs like <can't post it's name, it's hacking program>. These programs has 2 options
1) they try to use words from their library as password
2) they are trying combinations of characters, so if you have password with 8 characters including Lowercase, Uppercase, Signs and Numbers guess how many combinations are possible. That program would need weeks or months to try that.
Bit offtopic, sorry.