This category involves reaching the credits as fast as possible with no in game restrictions.
There are two major routes that are ran in this category: the Kakariko Bottle route, which was the fastest route until 2015, and the GIM Bottle route, which is currently the fastest route. The Kakariko Bottle route is much easier, has a lot of resources, and is generally a good run to do as a first speedrun for the game.
Here are the pages for each of those routes:
Any% Kakariko Route
Any% GIM Route