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!
By default, the newest version of WordPress is pretty secure. Anything which may have been added to any how to fix hacked wordpress site plugins has been considered by the development team of WordPress . Before, WordPress did have holes but most of them are stuffed up.
Is also significant. You need to backup database and all the files you can easily bring your blog this content back like nothing happened.
Yes, you need to do regular backups of your site. I recommend at least a weekly database backup and a monthly "full" backup. More, if possible. Definitely more, if you make changes and additions to your site. If you have a community of people which are in there all the time, or make changes multiple times every day, a backup should be a minimum.
It is really sexy to fan official statement the flames of fear. That is what bloggers and journalists and politicians and public figures mostly do. It's great for readership and it brings money to the war chests. Balderdash.
I prefer to use a WordPress plugin to get the work done. Make sure is in a position to do backups, has restore functionality, and can clone. Be sure it is frequently updated to keep pace with all new versions of WordPress. There is no use in not functioning, and backing up your data to a plugin that is out of date.