In minecraft, what are the best ways to farm experience quickly? Name pros and cons
One way you could do this is by building a mob farm. A typical farm in the over world would involve the following steps:
* Build a 9x9 square midair platform that will act as a spawning platform.
* Then completely enclose it with solid blocks so that no light can get in. Make sure the enclosed area is tall enough for mobs to spawn within the area. (Including the enclosing walls the platform should be 11x11.
* Put water source blocks at the corners of the spawning area. This should cause all except the center tile to be covered in water.
* Remove the center tile of the platform. The water will cause the mobs that spawn to fall down the hole.
* Now, make a vertical pipe going downwards from the hole which will cause the mobs to fall 23 blocks. This will cause the mobs to be left at 1 hp after their fall.
* Lastly, make an opening that will allow you to kill the mobs when they fall. Each mob you kill will award you with experience.

It is worth noting that building the farm high up in the air can increase yields since there will be fewer areas outside the farm that mobs can spawn. For this reason, it might be good to light the area above the farm to prevent mobs from spawning there. Additionally, this farm is a great way to get drops from creepers, skeletons, and zombies. If you want to farm other things instead, a different type of mob farm might be suitable.

Alternatively, if command blocks are enabled or you are in creative mode, you may be able to acquire a large amount of bottles o' enchanting which, when tossed, give the player a massive amount of exp.