I am kind of new to SharePoint. I am learning it on the go and learned about the concept of pagelayout and publishing features on the site. But I am not really 100% sure what is the difference between a WebPartPage, SitePage and PublishingPage. I kind of know what all these pages be used for, but what I not get is: why do they need to separate all these pages?
I think we can just get a publishing page and have all the feature there including webpart and everything else (with our choice of PageLayout). However I dont see a way to use a pagelayout on a particular SitePage.
Is there any particular reasons for using either one of them? Even though it seems like one of them can serve as all of them?