Doctype is a collection of Data fields, which enables you to Collect and Store the Data, Doctype has different views : Form View, List View. Also, user can create Reports based on data fields in Doctypes.
1. Click on New Doctype icon under App on Desk.
Navigate and Expand the desired App (In Left-side bar) under which you want to Add/Create New Doctype, Click on "New Doctype" .
2. Enter "Doctype Name" in Pop-up Dialogue, Click on "Create" Button, You will be landed to Doctype Editor.