Hey kiddo, so a "ridge church" is a kind of church that's built on or near a ridge, which is a long and narrow strip of land that rises up higher than the land around it. This means that the church is probably up on a hill or a mountain, which can be pretty cool because you can see a lot of the area around you.
Ridge churches usually have a really pretty view and they can also be considered landmarks because they're often seen from far away. They're also sometimes called "mountain churches" or "highland churches".
But at the end of the day, the name "ridge church" really just describes the location of the church rather than what kind of church it is or what they do there. Hope that helps!