There are four types of mob passive, hostile,neutral and boss. Boss and hostile are dangerous and will attack even if your not doing anything to them.Neutral will attack if they are attacked. Passive won't attack even if you hit them
Those are ender dragons.
This is a video of all the mobs exept the spider jocky, wither and witch.
The ender dragon is my favourite mob the wither is my second and my third is the zombie pig man.
dangerous mob tatics
zombies
=run up to you and hit you
skeleton
=shoot with a bow and arrow
creeper
=run up to you and go
BOOM
spider
=run up to you and head-butt you
blaze
=shoots fire balls at you
cave spider
=same as normal spider
ghast
=same as blaze
magma cube
=bounces to you then bounces and comes down on you