1.Creeper
Creepers are dangerous and very sneaky.They blow up if you dont attack.The result of this will not cause you to die but you will loose the majority of your hearts depending on the distance you are from the attack
2.Zombie
Zombies are the least hostile monsters that spawn in dark areas.Without a sword zombies take 2 to 3 hits.They make loud easy to notice growling noises and are slow.
3.Enderman
Enderman will not attack you unless yuo stare at them .Enderman pick up blocks and destroy land.
4.Skeleton
Skeletons shoot with bow and arrows skeletons are fast and shoot almost constantly.