The picture above shows one of the mods in Minecraft, a zombie. The zombie appears at night and around the world. When a zombie spots you it will come to where you are and try to kill you. It walks pretty slow so you can kill it easily, with a sword, or run away from it if you don't.
The picture above shows another mod that appears in the night, a spider. When a spider sees you it will go towards you and jump on you causing damage.
This mod is called a skeleton. The skeleton has a bow and arrow equipped with it and can shoot you from a distance. The skeletons never run out of arrows so you better kill the skeleton fast.
The next mod that is shown above is called a creeper. What a creeper does as an attack is when you get to close it will automatically blow up and almost causing it to be an automatic death.
The mod above only appears in the nether, a place where you can find nether rack and other things you can't find in the world where you have first spawned. In the nether, there are tons of ghasts and they appear all the time. When they spot a player it will shoot out fire. You have to be careful with them since you can be set on fire.
The picture above shows a mod called an enderman. The enderman can appear in two places: the minecraft world and in the end. It can teleport as well so it can be hard to give it damage.Note: It also steals dirt blocks.
The enderdragon, the final boss in minecraft is a frecious dragon. It shoots out purple fire balls towards you and will try to kill you. The enderdragon will also swoop down to the ground and with this it can give you an advantage and shoot it with bow and arrows.