80% of Internet users have a smart phone, so your web sites simply must be mobile-compatible. Thanks to Twitter’s free Bootstrap template, this is now easy. Bootstrap has quickly become the most used template for mobile websites.
With Bootstrap the same web page adjusts itself to look good on full-size computers screens, laptops, tablets, phones, etc. Think of it as a “one size fits all” web page.
Bootstrap comes in all levels of complexity but it does require some basic HTML skills. There are many variants, so you can start with a simple blank page or a fully designed one. Bootstrap is also well-documented and has good tutorials.
Additionally: Google provides a very useful Mobile-Friendly Test site to see how your page looks on a phone and will give suggestions for improving. While Bootstrap is pretty amazing, it still may take some adjusting. Another good test site is here.
Bottom line: a great template if you are comfortable with a little coding.