You want your website to reach the widest audience, so be careful you are not alienating large segments by having a website that does not work properly in different computers, browsers and screen resolutions.

Endeavour to test your website on both Windows and Macintosh platforms, and install both Internet Explorer and Firefox on the Windows platform. Change your screen resolution and look at the website in 1024×768, 1280×1024 and 1400×800. You can go further, but this set of combinations will ensure you’re set for the vast majority of your visitors.