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 my blogs using a plugin WP DB Backup up. I can always restore my blog to the last settings if anything happens. I use my site to be scanned by WP Security Scan plugin that is free and requests that are suspicious-looking to be blocked by WordPress Firewall to fix wordpress malware removal.
Also, don't make the mistake of believing that your hosting company will have your back so far as WordPress backups go. Not always. It has been my experience that the hosting company may or may not be doing backups while they say that they do. Why take that kind of chance?
Move your wp-config.php file one directory up pop over to this web-site from the WordPress root. WordPress will search for it there if it can't be found in the root directory. Also, nobody will be able to read the file unless they've SSH or FTP access to your server.
You could get an SSL Encyption Security to your WordPress blogs. The SSL Security makes secure and encrypted communications with your site. So that all transactions are listed, you can keep history of communication and the all of the cookies. Make sure all your sites get SSL security for maximum protection from hackers.
But realize that security is. Don't only be the type that is reactive, take action to begin today protecting yourself. Do not let Joe the Hacker make your life miserable and turn everything in creating come crashing down in a matter of seconds that you've worked hard.