I agree with Miki. I think searchable helps are more appropriate for applications, such as office or photo editing, than for websites. So, I would stick to a FAQs.
FAQs are best used to reach a goal for your website. For instance,
SitePoint's FAQs set out the dos and don'ts to serve as a reference for our members. We also have a
How to that answers some extra questions which was written to save staff time in answering repetitive questions.
As far as tutorials, I Googled "writing FAQs" and if I were going to write a FAQ list, I would first read the top four to get ideas and tips.
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