JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Yes, that is possible. You can hide or show field or a group of fields based on some selection, change email, thank you page and so much more. You can see more about this here: Smart Forms Using Conditional Logic
If you have anything specific in mind, do let us know and we are likely to have some guide that shows how to achieve the same in more detail.
You can also take a look at our guides here: http://www.jotform.com/help/