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!
If you don't have good protection on your site, files can easily get lost. Some of those files may be saved in your computer and easily replaceable, but what about the rest of them? If you lose them the first time where are you going to get them from again? Especially for sites which have been in operation for quite a long time, secure your wordpress site is very important. Many times, long-term sites have created a high number of files and have a good deal of data. Recreating that all are a nightmare, and not something any business owner would More Help like to do.
Strong passwords - Do what you can to use a strong password, alpha-numeric. Easy to remember passwords are easy to guess!
You first need to create a user, before you can delete the default admin account. To do this go to your WordPress Dashboard and click on User -> Create New User. Enter all of the information you will need to enter.
Can you see that folder Imagine if you visit WP-Content/plugins? If so, upload this blank Index.html file inside that folder as well so people can't view what plugins you might have. Because if your version of WordPress is current, if you are using a plugin or an old plugin with a security hole, someone can use that to get access.
Of course you can set up more plugins to make your store more user friendly like share buttons or read review automatic backup plugin. That's all. Your store is now up and running!