What excatly is the effect of Rampaging Rhynos from Yu-Gi-Oh?

Answer 1

"Once per turn, this card can move to an adjacent unoccupied Monster Card Zone. If this card attacks the monster in its same column, this card gains 500 ATK during the Damage Step."

All Yu-Gi-Oh cards are played into slots in their respective zones. So you have five slots for monsters, five for Spell and Trap cards, and one slot for a Field Spell Card.

I will illustrate how Rampaging Rhynos' effect works. Imagine the field is like this, where the [] represent empty monster slots, R is Rampaging Rhynos, and K is, say, Kycoo the Ghost Destroyer.

[] [] R [] [] - Turn Player's monster zones

[] [] K [] [] - Opponent's monster zones

The Rampaging Rhynos is in the same column as Kycoo, so if he attacks Kycoo, he gains 500 ATK during the Damage Step.

Imagine another scenario. S is a Sangan

[] [] R [] []

[] [] S K []

Rampaging Rhynos can, once per turn, move into an adjacent monster zone, so,

[] [] [] R []

[] [] S K []

Now Rampaging Rhynos is in Kycoo's column, he can attack him and gain the 500 ATK bonus. If he stayed in the same zone, he would not be in the same column, and would not get the bonus.