There are three parts to a filter, a condition, a field, and an action. Filters are divided into two categories: predefined filters and custom filters. Predefined filters are templates for some of the most common filters. Custom filters let you customize to fit any unique situation.
Filters are applied in the order they appear in your configuration settings. Filter order matters. Once you have created a filter it is added to your filter library, and can be reused. Remember to try any new filters on your test view first. This helps prevent mistakes and ensures that you understand the effects of the filter before adding it to your master view.