Minecraft wiki entry for Mining, associated text: It is helpful to bring food, wood, coal, torches, weapons and a water bucket. The player may want to bring a bed if they are spending several days underground so they do not have to go back to their house to sleep. One must also make sure to bring two or more stacks of sticks, as they can quickly be crafted into a pickaxe, torch, sword, etc. if one is in dire need of one. A clock is also very helpful because you can tell when it is daytime so that you can safely return to the surface. Also, if the player has spare iron, it's recommended to bring iron pickaxes instead of stone pickaxes as they mine faster and have a higher durability. If the player is looking for obsidian, then they need to have a diamond pickaxe. If you are mining in the nether, it is often good to bring a few fire resistance potions, as well as all the previous things, other than a bed (Because beds explode in the nether). Also it is a good idea to know the coordinates of your portal, so that you don't get lost. Another good thing to bring to the nether is a piece of gold armor, as that will keep the piglins from attacking.