For my first attempt at WordPress I agreed to build a website to match someone else's graphic design. By a stroke of luck I chose Frontier as the theme to build on. It's easy to understand and highly adaptable with plenty of hooks to allow you to change layout, style and appearance. The responsiveness works very well. When I had one problem I couldn't solve I posted a question on the Frontier forum and got an answer - with the solution - within a few hours. It's great!