As a web developer, there is nothing more frustrating than a bug. It may be that something on the website has stopped working, for apparently no reason or it may be that a bit of code you have used on another site won’t work on a new one that you are building. Hours can be spent trying to find out the problem and sometimes to no avail.
When you are trying to fix a bug, you should take advantage of programs such as Firebox (part of Firefox browser) which allow you to pick apart code on the website to see why it is not displaying / working as it should. It also allows you to make live changes (local only) to the code to see if you can fix it. Once you have found what the issue is you can then apply the fix to the code. Forums are also a great way to get help with an error that you are unfamiliar with although it may take a while to get a response.