Minecraft wiki entry for Mechanics, associated text: Daylight cycle: As time passes, the sun and moon move through the sky, and the outdoor light level changes, affecting mob spawning.
Illager patrol: Occasional groups of illagers can spawn near players. Fighting them can inflict the Bad Omen status effect.
Tutorial hints‌[Java Edition only]: Tabs in the top right corner of the player's screen that appear when a player starts a world in Survival mode for the first time on a device.
Weather: The world experiences rain, overcast, snow, and storms, with effects varying by biome.
Zombie siege: If a player remains active near a village overnight, an invasion of zombies may appear.