Big commerce home page redesign to look like Sweetwater.com

Need a website design guru that can answer our questions in using Bigcommerce as there is no design help. We have the store up and it is live already see it at. [login to view URL] What we need is a line by line explanation of what each line of code does. For starters. We are using the Benefits Gray Template and want to know how to center the middle Featured product area just below the hero or carousel. We want to move things around. change color. change fonts. We know how to change the back ground We will be asking for this template to be picked apart. We want to learn this template inside and out. So that we can make design changes at will.