Many people who want to learn Python these days are looking to write web applications. Web apps are web sites that do something unique. If you understand how to develop web apps, you can ask for any input you want from users, and you can do just about anything you want with that input.
A web app takes in data from users, and does something with that data. There are all kinds of examples of web apps:
These examples all go beyond just managing content online. If you are just looking to manage content, you should be looking at a content-management system (CMS).
Web apps tie together lots of different kinds of programming. To understand what kinds of things you will get into in creating a web app, consider how a typical app works:
In order to make all of this happen, you need to develop some understanding of:
Modern frameworks take care of a lot of the lower-level details of these aspects, but if you are going to make decent web apps you will end up learning a good deal about all of this. The good news is it can be pretty interesting, and even fun to pull all of these pieces together to solve real problems for your users.