Pretty general and broad based question there. Not sure if anyone can explain to you on how to make a "good" website. I think that is up to those who are creating it.
I think if you looking to make a solid information website on hypnosis then look at this website as an example:
All About Vision: Guide to Eye Care and Vision Correction - LASIK, Contact Lenses and Eyeglasses
This is a website that is full of great info on eyeglasses and sunglasses and ranks very well. You could use it as a model of how to create a great information website.