For a start you spawn in a braand new game if  you wanna get to the basics here is the fist thing you need to do.

Go to a tree and put your mark in the middle of the comeputer on the tree.

Then hold down left click  and then press e to open your invotery and theres a box that says craft.

So you put your wood stack in one of  the squares and in the box next to  it will come up as wooden planks .

so with right cllick to build and make a little  square and build up in the same way then make a roof and floor.crafting; Then you want to make a crafting table so i want to put 4 planks in all he four squares and theres a crafting  table.

then left cllick on the crafting table