It goes without saying that the best way to go about errors is to avoid them. People neither have the time nor the nerves to deal with technical problems, while browsing your site with a certain goal in mind. So you should do everything in your power to avoid errors.
Yet, there is little you can do about the unexpected. No matter how hard you try, some users will run into a dead end at some point. It might or not be your fault, but you should be prepared for when it happens.
Customized 404 error pages have become the rule. We see them almost every time that we try to visit a broken or non-existing link. Webmasters have realized that classic 404 error messages can have a negative impact on the user experience. They are negatively phrased, boring and for most people too technical to truly understand. Customized error pages on the other hand can have a positive impact.
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