This chapter dealt with data coming from the user and data that, because of that, needs to be validated; otherwise, it would be possible to submit invalid information, even if improperly formatted. After reading through this chapter, you should be able to design a form to receive complex data structures as well as validate them.
For validation, you should probably stick to data annotations attributes and IValidatableObject implementations, if need be. These are used in a plethora of other .NET APIs and are pretty much the standard for validation.
It would be good to implement client-side validation and AJAX as it provides a much better user experience, but never forget to alsovalidate on the server side!
There is probably no need for custom model binders as the included ones seem to cover most cases.
Display and editor templates are very handy, so you should try to use them as it may reduce the code you need to add every time, especially...