Via using a secure your wordpress website backup plugin, the best way to make sure that your WordPress security is in my opinion. This is a relatively inexpensive, easy and elegant to use way to make sure your site is accessible to you in the event of a disaster.
No software system is resistant to bugs and vulnerabilities. Security holes will be found and men will do their best to exploit them. Keeping your software up-to-date is a good way once security holes are found, because their products will be fixed by reliable software vendors.
You first need to create a new user with administrator rights before you can delete the default admin account. To do this go to your WordPress Dashboard and click on User -> Create New User. Then enter all the information you need to enter.
It's really sexy to fan 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 from this source into the war chests. Balderdash.
Don't use wp_. Web hosting providers are removing that default but if yours does not, fix wp_ to anything else but that.