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 frequently using a free plugin WP DB Backup. If anything happens I can always restore my blog. I use WP Security Scan plugin that is free to scan my site frequently and requests to be blocked by WordPress Firewall to fix wordpress malware plugin.
Protect your login credentials - Don't keep your login credentials where a hacker could find them. Store them off, and even offline. Roboform is good for protecting them, also. Food for thought!
This is quite useful plugin, protecting you against brute-force password-crack attacks. It keeps track of the IP address of every login attempt. You can configure the plugin to disable login attempts when a certain his response number of failed attempts is reached.
Install the WordPress Firewall Plugin. This plugin investigates web requests with WordPress-specific heuristics that are easy to recognize and stop attacks that are obvious.
But realize that online security is something that you really need to start thinking about. Do not just be the type, consider action to begin protecting yourself today. Don't let Joe the Hacker make your life miserable and turn everything that you've worked hard.