The BlockheadsMore guides, cheats and FAQS
Spades are great for digging through dirt
Machetes will allow you to harvest plants efficiently
Axes are great for lopping down trees
Pickaxes help you mine ore and rock.
A big help within a game is that it'll show you when you have the most efficient tool equipped. If you tap on a cube and it gets a green outline it's ok. A red outline means the tool will be blunted much more quickly if you carry on using it.