Designing a useful website depends upon so many factors. First it needs to be very clear who determines your website is useful? The answer is very clear the ‘visitors'! Your website visitors are the supreme judges of your website and they can only determine whether your site is useful, informative or it's simply worthless! So with this concept you should design a website such a way that can fulfill your visitors’ requirements and make them happy. If visitors can find your site as useful one then you can surely earn good revenue from your website. Now the question is how to make a website that would be considered useful by your visitors?
First you need to be very sure about the product or service you're offering through your website. You need to know what your visitors would like to get from your product or service that you're offering through your website. Based upon that, ensure you can reach successfully to your potential customers through the website.
Try to be perfect and relevant about your sites’ titles in each and every page. Make sure you're very specific about the headings you're using within your website. They basically attract the visitors to find out the things they're searching for. So there should not be any false promise or misleading information.
Your website design should reflect the product or service you're offering. The design, color combination should not speak any irrelevancy that can proves you unprofessional, for that case you could miss lots of potential customers. The content part is also very important. It should not say something that seems irrelevant from your target product or service.
Make your website users as well as search engines friendly. There should be good navigation and less downloading time so that your website gets much credibility and usefulness.
Linking structure of your website should be very good. For internal linking structure, don't just try to link a page to improve any keyword's ranking in search engines. Try to refer a visitor from one page to another so that he/she could get more useful and relevant information. For back-links also try to get from high quality and relevant websites. It will definitely help you to make your website more trustworthy and useful both in your visitors and search engines eyes.
Think about the uniqueness. Make your website such a way that would have ‘wow factor’ and your visitors would prefer to revisit it again. That can definitely help you to generate more successful business in coming days.