to occupy, take possession of, a base
據 centers on establishing a firm position: occupying a place, taking possession, or using something as a base from which to act.
據 combines 扌 (hand) with 豦, which likely contributes the sound and may relate to a wild boar or a base. The character suggests using the hand to hold or occupy a position.
The hand radical 扌 beside 豦 (a shape associated with a base or a boar) suggests a hand firmly holding a base or occupying a spot.
For キョ, imagine a key (キー) that lets you occupy a base: key -> キョ, and your hand holds the key to take possession.