Two new pages and some additional adjustments by gallegogt@gmail.com

Updating with changes made by gallegogt@gmail.com and other menor adjustments to getting started or how use it, page.
Quizas modifying no es la palabra correcta, al referirse a html elements, se pudiera usar algo como:

Which other helpers you can use for **working** with html elements?

o cambiar de contexto, ya no serian html elements sino **DOM tree**

Which other helpers you can use for modifying the DOM tree?

En lo particular la primero opción me gusta más.