Building websites today require you to be more mindful of the platform it will be viewed on. Back in the day you had to worry about different sizes of screen and that was all. Today your site has a better chance of being seen on a mobile device or tablet than a computer screen. As a result you need to make sure you site looks and responds appropriately on that phone or tablet.
Below are a series of links that I've found useful or would like to try out.
