Overworld

Overworld is a dimension where the player starts, it is a dimension filled with passive mobs like animals. The dimension's surface is mostly made from grass blocks. This dimension is very habitable due to the resources available in the dimension.

The Overworld is filled with trees, plants, animals, villages, caves, and other structures. There are a lot of food sources here, a lot of building blocks, and a lot of space to build here, so surviving here is not really difficult. Monsters can spawn here, but most of them will burn and die at the daytime, they will only spawn at nighttime or in dark places.

Villages are structures that can be found here, it consists of houses, a well, a church, and bells. It is filled with villagers that you can trade with. These mobs are passive, you can find crops here that you can use to make foods.

The caves here are filled with a lot of ores, such as iron, gold, diamond, emerald, and coal. Some of them can only be found in specific biomes like emeralds that can only be found in extreme hills.

There are a huge variety of biomes here, like desert, mountain, plain, forest, and badlands. Each of them contains different mobs and different temperatures. In cold biomes, snowfalls can occur. In warm biomes, rains can occur. In hot biomes, no rain can occur, the sky will just become darker.

To enter the dimension, you will just need to create a new world or by simply returning back from another dimension (only if you entered that dimension from the Overworld).