The Portfolio page
Doctype includes a custom page template for Portfolio. In order to get started you need to create a new page and assign the Portfolio Template to it. Go to Pages > Add New. Give a title to the page, e.g. Portfolio and select ‘Portfolio’ under templates, from the Page Attributes panel on the right. The screenshot below shows that.
Note: Under "templates" you will also see a template named "Portfolio-Filterable". This one will show filters at the top of the portfolio page.