Way To Search Content I am new to Drupal and am currently trying to edit some pages on a site I inherited. The site does not seem well-organized as there is a panoply of URL redirects and aliases. As a result, I am having a difficult time finding the right pages to edit. 

Is there a way to just search for the path and have it return the right content to edit? Perhaps there is a module for that?

As an example, I have a page www.example.com/donate which needs to be edited. When I look under aliases and URL redirects, "donate" returns nothing. How can I go about finding this particular page?
Not all Drupal paths end with a content (or node) page. For example, the D7 core Contact module has the path /contact, but in order to "edit" it you need to change administration pages within the admin section (/admin...) or a theme template if you're wanting to change how the HTML is rendered.

The closest thing to what you're looking for is the menu_router (D7) or router (D8) database table. These DB tables contain static/dynamic paths (the path column) with additional metadata about what/how these paths rendered. They should help you discover what controls paths that aren't node or node alias paths.