Use cases of Web Forms. Edit existed entities

Hi. Can someone help me to understand use cases of Web Forms in frappe?
As I understand, I can create some new DocType objects in database using Web Forms. Is it posible to edit existed entities using Web Form? How?
For example, I have some DocType named ‘Post’. I want to achieve posibility to edit already created posts using Web Form by going on adress like Post.
Is it possible to achieve this behavior using web forms?