Whenever you would like to create a new page, you have the possibility to do so by using CMS Pages. At this moment we are testing a Pagebuilder module, where you'd have even more freedom - to even create your own "design" in the content (arrange blocks, etc.). For now, the default CMS Pages will do the trick.
Log in to the backend of Magento
Go to Content > Elements > Pages
In the right upper corner press "Add New Page"
Enter the Page Title
Open the Content tab, here you can enter the content of the page.
If you do not want to work with HTML codes, you can press the button "Show / Hide Editor"
Open the Search Engine Optimization tab, here you can enter the URL key
Make sure you are not using spaces, strange characters and capital letters
Replace spaces with dashes (-), strange characters with the normal character and capital letters with small letters
Open the Design tab, here you can select the design of the page
1 column
2 columns left sidebar
2 columns right sidebar
3 columns
Whenever you're done, click Save & Close
Try visiting the page by using the URL Key and paste it behind the main URL of the webshop