Is it possible to make pinterest looking app if I finish all the course? I mean like the function user sign up process.

I'm only 2 weeks in, but I'm very confident from the amount of knowledge that iv'e learned in the short amount of time, I will be able to create such an app. There are a few different courses you must take to be able to design an app like pintrest, but it is absolutely possible through these courses!

Yes, you will learn how to do everything (including sign up and sign in functions) I knew absolutely nothing when I started and now I can create simple android apps.

You will get a solid foundation from the courses they have here, but more importantly Ben's style of teaching does something that will help you continue to grow beyond the few projects here.. He talks about going out and finding the answers to your questions on the internet and how you need to go to the documentation and read up on things. Those are invaluable and realistic things that need to be learned besides just following along and typing what he types. With the courses here(make a habit of going back and reading over the code to really understand how it works) and you doing your own side study(Java and Android documentation, using google, youtube tutorials, etc), you will definitely be able to create a Pinterest like app and whatever else may come to mind. My wife loves that Pinterest site, shes on it allllll the time lol