Hoes are tools used to till dirt blocks into farmland blocks, the first step in farming wheat, melons or pumpkins. In order to craft a hoe you first need a Crafting Table, Left Trigger on a Crafting Table to craft items. You then need 2 Wooden Planks and 2 Sticks.
I have also added a video below with all the additional information and uses of Farming if you're interested. It can be very useful and educational so please give it a quick play!
If you find this solution to be unhelpful, please tell me why in a comment and I will update it the next time I'm online.