Hola. Quisiera saber si puedo cambiar el nombre de mi sitio.

There are thousands of themes and tens of thousands of plugins. There is no way you could use them all.

I know you are eager to get things going as quickly as possible. Just follow the lessons as outlined and don't jump ahead. It will all be gone over as you go through them. :)
Let me know if I can help.
Marc

Kyle walks you through the steps in Lesson 5 of the Certification Course and will cover which updates and plugins you will want to activate. Hope this helps.