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!
Backing up your site also helps in securing from fix malware problems free hackers. You must keep a copy of your files hide away in backup system that you can be confident of your database. This makes you a protected files that serves you in times of sudden down is the system. Hackers are less likely to slip from a secured back up system.
A simple way is to use a few tools. First of all, do not allow people run a web host security scan to list the documents in your folders and automatically backup your web hosting account.
Exploit try here Scanner goes through the files on your website place, comment and database tables. You are also notified by it for plugin names. It does not remove anything, it warns you for threats.
Whitelists phrases and black based on which field they appear within, in a page request. (unknown/numeric parameters vs. known post bodies, remark bodies, etc.).
Don't use wp_ as a prefix for your own databases. Web hosting providers are eliminating that default but if yours doesn't, adjust wp_ to anything else but that.