The php would call that component with regards to whether the page slug matches the conditions. So if the page slug is index, it calls the sidebar component, if the slug is anything else (with polyfragmented's framework), a blank space is output.
A book isn't entirely necessary to understand just some basics to get you going - Google some online tutorials to help you.
A book isn't entirely necessary to understand just some basics to get you going - Google some online tutorials to help you.