WordPress has the ability to create child themes so that child theme gets the characteristics of a parent theme. Child theme allows you to use and edit a master theme, save the child theme separately without affecting the parent theme. 

Here is the the list of Wordpress Themes providers in the market. We listed free and premium Wordpress Themes providers in the online web.

Do you want to know the basic problems that occur in wordpress while you are at the beginning of learning stage.
Just beaware of these problems and get know the solutions.