https://www.gamespot.com/articles/monster-hunter-world-guide-how-to-capture-a-large-/1100-6456419/

The name of the game in Monster Hunter is, obviously, hunting monsters. But whether you're assigned to hunt down a particular creature or you happen upon one during an Expedition, you don't necessarily have to kill it. Capturing monsters is often the best way to go, and in some cases it's a mandatory aspect of a given quest. Monster Hunter World makes strides in welcoming in new players, but the process still might be unclear. Here's exactly how to do it.