Link to part 1
The chest is very useful to store things, you can craft it with wood :
Then place it like a workbench
You can also make a large chest by placing 2 small chests togther
It does not make them store more things, a large chest has the same capacity as 2 small chests.
A good way to mine is to dig some kind of stairs to the bottom of the world, where you can find rare ore, just beware not to mine right up to your head, there might be sand or gravel in the upper block that falls when there is nothing under it, and do not dig under you also, there are a lot of caves.
In the game you can find different kinds of ore: iron, gold and diamond.
Gold is not very useful, tools made of gold are as weak as wooden tools.
Iron makes stronger tools than stone, and diamond tools are even better.
This is what iron blocks look like:
To mine gold or diamond blocks, you need an iron pickaxe or better, trying to mine those blocks with a stone pickaxe will simply destroy them without adding it in your inventory.
While mining diamond directly drops diamonds in your inventory, mining iron or gold only gives you ore blocks, to get a material you can use for crafting, you need a furnace.
You can craft a furnace like a chest but with stone :
Then to use it put coal in the lower part and an iron block above it :
With a furnace you can also cook meat, or produce glass from sand. If you lack coal, you can replace it with wood.
You can craft armor pieces from gold, iron, diamond and leather. Leather is obtained by killing cows.
There are 4 different armor pieces : helmet, chestplates, leggings and boots.
There are still a lot of things to tell, but this is just a beginner's guide that explains enough to enjoy the game :)