minecraft is really dumb and makes 0 sense.
Its all really simple, you gotta build a home in a dirt mountain, avoid green snakees, magically turn iron into steel by using it with a flint, mine down, find diamonds, see green snakees and skeletons behind you as you see them, freak out, die, delete world, and repeat.
Or you could do the safe thing and play multiplayer on a server without enemy mobs.