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 restore my blog. I use my blog to be scanned by WP Security Scan plugin that is free regularly and asks that are suspicious-looking to be blocked by WordPress Firewall to clean hacked wordpress site.
Do not depend on your internet host - Many men and women rely on their web host to"do all that technical stuff for me", not realizing that sometimes, they don't! Far better to have the responsibility lie with you, rather than out.
A snap to move - If, More Info for some reason, you need to relocate your website, like a domain name change or a new hosting company, having your files at your fingertips can save you oodles of time, hassle, and the need for tech help.
Now we're getting into matters. Whenever you install WordPress, you need to edit the document config-sample.php and rename it to config.php. You need to install the database details there.
I prefer to use a WordPress plugin to get the work done. Make sure that the plugin you choose is able to do select backups, has view publisher site restore and can replicate. Be sure it is often updated to keep pace. There is no use in not working, and backing your data up to a plugin that is out of date.