The new cave generation coming with the upcoming 'Caves and Cliffs Update' is finally here in the latest Minecraft: Java Edition snapshot.

Importantly, Minecraft Java mods tend to be free, while Bedrock add-ons can be either free or paid downloads in the Minecraft Marketplace.

To install these mods, you'll need to use a free add-on called Minecraft Forge. This will let you customize Minecraft: Java Edition with mods.