Speak Up & Stay Safe on FeministFrequency is another good resource.
These steps will prevent people from breaking into your accounts by exploiting weak passwords or weak storage.
Remember that even if you have good passwords, most people re-use passwords. So if you use the same password for your e-mail and some random website, and the random website gets hacked, the hacker now has your e-mail and the password.
- Download 1Password or something like it
- Come up with a good master pass-phrase that can be typed like an English sentence (like "This is my password.")