I am a newbie and need to create a
Page Content Type.
How can I go ahead and do it? Also describe the significance of it.
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As I understand from you at comments that I think it's not related to what you ask above, you need to create a master page in SharePoint 2013.
Then follow the mentioned detail steps at
If you stuck at any step please mention this at comments.
Content type is a term similar to template
It is the collection of features common to similar types of files once they are uploaded to sharepoint, example the image content type (inside the picture library) is made up of several information, such as title, keywords, thumbnail author, date and time that are not present by default to other content types.
When it comes down to Page content types, I can recall off top of my head Wiki page, web part page, Project Page, Enterprise wiki page, article page, you can customize any of those adding fields ( =columns) with mandatory or optional information to fill in (example, you want to add a choice field to specify the department, you simply add a column to the existing content type). If you want to instead customize the areas of the page or add controls, this needs to be done with SPDesigner and you need to know coding.