It doesn’t matter what you’re selling: web design services or headphones. When a prospective customer arrives on your website, it’s like they are walking into your store.
The main problem is that unlike when they actually walk into a store, there’s usually no one around who they can ask for help if they have a question.
Which is why many modern (customer conscious) websites have an FAQ. This is where the customer can find answers to specific questions related to the purchase and use of your offering.