1. Don't be afraid to create long passwords. It's better to write down secure passwords than try to memorize short ones. Keep passwords written by hand on paper which you can keep secure in your home office. Don't save unencrypted passwords on your computer or online.
2. Passwords should always contain uppercase, lowercase letters and numbers. If allowed also consider using symbols such as ! or %. A good way to generate long passwords are to select 2 or more unrelated words, connect them with numbers, randomly capitalize some letters and, finally, adding a special character. Example: giRaffe43tEnnis24!
3. Never give out your social security number online.
4. Never click on links in suspicious emails. If the email is supposed to be from a company you do business with, such as your bank, then first right-click on the link and select "copy link". Then paste the link in a text file or word document, and see if it is actually from your bank's web site.