There are a few quick easy tips to just give yourself a step up on the would be hackers out there.
1. Upgrade – Always make sure your running the latest version of wordpress. If you are self-hosted do this as soon as you receive notice of the latest upgrades. If you are using managed-hosting contact your provider if you are not being updated within a week.
2. Delete the default administrator – Create a new administrator with a complex username, login with that account and delete the default administrator. Leaving the administrator’s username as “admin” makes cracking your login details 100% faster.
3. Create a really strong password – Passwords can never be too complex. Use a password manager to make remembering passwords easier, and consider using strongpasswordgenerator.com to generate the password itself.
4. Disable user registration – Go to the Setting >> General and verify that “Anyone can register” is not checked. If you need/want other people to have access, there are many plugs that allow access, either by invitation or membership.
Now these might not directly stop hackers but can be a life savers:
Contact Form – use a contact form that hides your email address, this will make it more difficult for hackers to start spamming you.
Backups – if you do get hacked or some other disater, you easily restore your data.