Go To WP Menu => Pages => Click on Add New
First, you have to create a Project page from WordPress dashboard > Pages > click on add new and create a Project page
select the Project page template from the right side of your page you have to select the Project page template from the template list.
when you are selecting a Project page template you can see three types of Project pages both are in different columns, select one as per your requirement.
Go to WP Menu => Click on Project => Click On Add New
In Project Submenu, you have to add title and Project subtitle with Project Description.
In project single view Detail you have to attach the URL of your project and check It if you want to open the link in a new tab.
On the right side you can see a Featured image From there you can select the image by clicking on the set featured image and taking an image size (600 X 516).
On the right side, you can create a category by clicking on Add New Category and selecting All or you want to create a parent category for any category you can select a parent category for that.