Capturing data online has been a field of design and implementation for many years. Also, designing the best paper forms has been around for more than half a century. A different medium doesn’t necessarily mean different design principles.
“Forms are one of the most important parts of any site or app – they are the most common way for our users to give us the information that we need to help them do what they want to do.”
(Martin Polley a.k.a. @martinpolley ~ Boxes and Arrows)