Keep headers/logos under 125 pixels high. It takes up valuable viewing space, especially for laptop users, that is best left for the good stuff to appear"above the fold." Take a cue from the big companies, simple logos done well say it all. This is our #1 pet peeve - screaming logos and headers!
I back up my blogs using a plugin WP DB Backup. If anything happens I can always restore my website. I use WP Security Scan free plugin to scan my blog and WordPress Firewall to block requests to how to fix hacked wordpress site.
Basically, it will start with the basics. Try using passwords. Use numbers, letters, special characters, and spaces and combine them to create a password. You can also use usernames that aren't look at this site obvious.
I don't think there's a person out there special info that after learning just how much of a problem WordPress hacking is that it is a fantastic idea. Something I've noticed through the years is that when it comes to securing their sites, bloggers seem to be stuck in this state that is reactive.
Upgrade if you aren't currently running the latest version of WordPress. Leaving your site is similar to keeping your door unlocked when you leave for vacation.
Change your WordPress password and admin username, or at least your password and collect and utilize other fantastic WordPress security tips to keep hackers out!