The beauty of a website is that it is the one place where people can learn all about you; your work, the latest news, how to connect to your social media, how to sign up for your newsletter etc. It really depends what you wish to put on your site however, the bottom line is that you need all your information put together in one place.
I'm definitely not an expert on websites. In fact, my first website was put together by a friend and it was free. Since that time, I've moved on to get a domain name and a site that I threw together myself. It's not elaborate but it works. It's simple and contains information on my books, interviews, articles I've written and a little bit about me. Again, nothing fancy but it serves the purpose.
I think it's also important to note that websites should be clear and simple. People go to sites to find out basic information and if you're an author, that could be to find a list of your books, learn who you are, check out your interviews and social media. If they go to your site and find it cluttered, confusing or lacks the information they want, chances are they won't stick around for long.
If you aren't super techy and a little intimidated by creating your own website, I would recommend you do a Google search to learn about the best approach for you.