Any%
Any% is a term used in speedrunning to denote the objective of simply clearing the game without the requirement of completing anything else. The Super Mario Odyssey Any% run begins when selecting the Start button on a new save file, and ends when Mario shoots out of the final wire in the Moon Kingdom during the Bowser escape sequence.
Speedrun route
Because the only requirement to progress to the next kingdom in an initial playthrough of the game is to collect enough moons within the current kingdom, the Any% route is mostly modular, meaning the routing in each kingdom is mainly independent of the routing in other kingdoms. There are a few minor exceptions to this, such as planning to collect enough coins throughout the run to purchase Power Moons from the Crazy Cap shops in the Wooded Kingdom and Snow Kingdom.
Tutorials
Smallant made a great series of tutorials oriented towards beginners. This is a definite must watch for anyone looking into running the game.
https://www.youtube.com/playlist?list=PLiinoyifvFb64od8RyqPFmVqDrFwkgaa0
Progression Video
Smallant also made a video explaining how the Any% category reached the point where it was beaten in under an hour, which can be found here