Does a wandering trader Despawn with a name tag?
A wandering trader despawns after being loaded for 48000 ticks (40 minutes, or 2 full Minecraft days), although ticks spent with the trading UI open are not counted. Naming the wandering trader with a name tag or placing the wandering trader in a boat/minecart does not prevent it from despawning.
Summon a wandering trader with DespawnDelay set to 500 (note that with just "/summon wandering_trader", DespawnDelay will be 0, which prevents the wandering trader from despawning.
If a wandering trader comes by, they have a chance to get more villagers. The wandering trader will still despawn if he doesn't breed and convert into a villager, so the player will have to make them breed before he does.
You can summon a wandering trader whenever you want using a cheat (game command) in Minecraft. This is done using the /summon command.
After the time expires, the wandering trader will despawn. They will despawn even if they are named with a name tag or put in a vehicle such as a minecart or a boat.
A. No, wandering traders will eventually despawn even if you have placed them in a boat or named them with a name tag.
Even when killed by a zombie on hard difficulty, wandering traders never become zombie villagers, despite being a villager-type mob.
When they see a hostile mob or when it is night, a wandering trader may drink an invisibility potion to become invisible. They will then drink milk during the morning to neutralize the effect.
Wandering trader farming is the process of farming wandering traders for their trades, and/or disposing them and their llamas to get leads and leather. It's a farm to build to glitchlessly renewably farm items like sand, red sand and small dripleaf.
Players can breed two adult villagers by putting beds next to them and giving them bread, but wandering traders cannot breed.
Do iron golems protect wandering traders?
Attacking a wandering trader near a village with an iron golem will not anger the golem, despite the trader itself being a villager-like mob. I have tested this multiple times by attacking/killing wandering traders near a naturally-spawned golem.
Whenever a player kills one, a system similar to Village Popularity will have points decreased (e.g. everytime you kill a trader you lose 10 points). This will decrease their spawning rate and quality of trades of further Traders more the lower it gets.

Slimeball. Slimeballs are the best item that the players can get from a Wandering Trader in Minecraft. From a usage standpoint the slimeballs are the rarest and most useable item in this chart with which players can make sticky pistons and more.
Trading. Wandering traders can sell a cactus for three emeralds.
Wandering Traders will open doors in attempts to trade with someone new, but they cannot open Iron doors like most mobs. They can also have the function to leash their llamas to fence gates, so they can trade. Also, when a llama is unleashed, a wandering trader can re-leash them.
Villagers near the cured villager are also affected but offer fewer, smaller discounts. Zombie villagers that are in the process of converting do not despawn if the player moves far away from them, but like all monsters, they despawn if the difficulty is changed to Peaceful.
This has been tested on guardians, skeletons, Endermites, Silverfish, etc. However, nearly all creepers named with a nametag will despawn instantly when the chunk is unloaded by either entering the nether or moving far enough away in the overworld.
If you rename a wandering trader, the game checks for its previous name in your list and overwrites it with the new name. If you attack a wandering trader or one of its llamas, or if it dies, its name is removed from your list and it will not return :( There!
As such, the Wandering Trader is useful for rare saplings, flowers, or even blue ice and podzol. His best trade is most definitely his Nautilus Shell trade for 5 emeralds, which can make building a Conduit with a Heart of the Sea much easier.
Llamas can be tamed by repetitively riding them until hearts are displayed, done by pressing use on the llama while holding nothing.
Can you get obsidian from a wandering trader?
Due to this, it is impossible to get obsidian and lava in this gamemode--unless you add the features where wandering traders trade like four emeralds for a couple of obsidian, thereby allowing me to get obsidian in superflat survival with no structures.
Wandering Trader should rarely sell Bucket of Axolotl. This would be his rarest and most expensive offer. If it does appear, you can only buy one, after which the offer will be blocked.
Currently Spore Blossoms are non-renewable, so with this addition it will be renewable and bit easy to obtain them ( Wandering Trader sells most of the other lush cave blocks ) and will also make the Wandering Traders even more useful ( Currently most Players kill them for leads ).
A simple trick on how to steal wandering trader's llamas. Just put them in a boat and the lead will break. :) : r/Minecraft.
Job sites are not required for villagers to breed. The breeding depends on the number of valid beds. If a villager is "willing" (see § Willingness below), villagers breed as long as there are unclaimed beds available within the limits of the village.