Minecraft wiki entry for Experience_farming, associated text: Fishing can function as a slow experience farm, with only two string and three sticks as an "entrance" fee to get started. However, it is wise to set up a secure fishing pond: You'll want a stretch of water at least two blocks deep and a few across (basically big enough not to accidentally miss the water). The water should be open to the sky, but you should have a lit, sheltered area to fish from, with a roof to fend off phantoms, and fences or glass to keep monsters from spotting and targeting you (a bit of height will help too). You should also make sure that you can reach the fishing area when it's night or storming, and that you can quickly climb back up if you happen to fall into the water. You will want at least one double-chest to store your catches (and your rod, when not in use).