Underground exploration and mining

for example, this picture can tell you the distribution (height) of minerals in the world. It is suggested that the building owner first dig 29 iron ores and burn them into iron ingots (to make an iron pick, an iron sword and a set of iron armor), and then go to the 16th floor to find diamonds (it is suggested to dig on the 11th floor, because it is the magmatic layer)

(from wiki)

in addition, Don't forget to bring food (more is better, but don't occupy too much backpack space, 3 spaces is enough)

don't forget to bring wood, which is very useful (you can make a torch when you dig coal), and light up all the roads you walk with a torch (to prevent brush monsters)

1. choose one of the many open-air caves and start exploring, Try to move your exploration path down as much as possible. Even shallow caves can provide abundant reserves of coal and iron ore, and there are other deposits such as gold ore in deeper layers. The advantage of cave exploration is that it doesn't need to dig a lot of stones, but on the other hand, there are many monsters in the cave, and the terrain is dangerous. Whether it is water or lava, it will cause certain obstacles

2. if you don't find an easy access cave entrance, but find a shaft or Canyon, mining there is also a good choice. You can use a bucket to artificially create a waterfall so that you can swim to the bottom (or up) of the canyon, and then you can explore the caves deep in the canyon in the way described above. Watch out for falling monsters! Climbers are a particular headache. Even if it doesn't bring you death, it may make you live worse than death, and it may destroy the minerals you want to dig. You can use skilful jumps to light up cliffs, or to reach tunnels that look tall

3. of course, you can also make your own entrance to the underground world: dig a vertical shaft in a convenient location (such as the basement of a room), and then start digging horizontally at a suitable height. Usually, this method wastes more tools (because all the channels need to be g by themselves), but with proper lighting, you can hardly see monsters. You may have g a natural cave (in fact, the probability is very high!), At this time, you can refer to the previous skills for cave exploration. There are many different opinions about the optimal mining strategy, but at the beginning of mining, the safest method should be mining 1 × 3 shaft with staircase in the middle to avoid falling. No matter how you arrange your mine, please ensure a certain amount of light to prevent monsters. Of course, when the resources in the cave are exhausted, you can go back to your mine to continue mining

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(from wiki)

if the building owner thinks it is too troublesome to dig an artificial mine, then the natural mine is a good choice (disadvantages: 1. It's very easy to get lost, so it's necessary to take marks such as sand; 2; 2. There are many monsters, don't try easily without good equipment)

for more details, please refer to: https://minecraft-zh.gamepedia.com/%E6%95%99%E7%A8%8B/%E9%87%87%E7%9F%BF%E6%8A%80%E6%9C%AF