WoW - Who can add sockets to items?

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For example, Blacksmith can add a socket to belt. It is only for soulbound belts and only up to 600lvl, but anyway.
What are other possibilities to add sockets to items? How many sockets can be added to one item? Does this forbid additional enchant on item or not? Is it possible for other person gear with lvl>600?
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Can you add sockets to gear in wow?
Sockets are restricted to items that can have sockets (Helm, Armour, Weapon and Shield). Unique (Gold), Set (Green) and Rare (Yellow) items will always gain a single socket.Can you add sockets to set items?
Spatial Realignment Apparatus from Ve'nari to add a socket to your Legendary item, the answer is yes. The twist is not all slots can have sockets. If your Legendary items are Helms, Necks, Bracers, Belts, or Rings, you CAN ADD A SOCKET TO THEM.Can you add socket to legendary item?
Previously on the PTR, only newly-created Shadowlands Legendaries were set to receive a gem socket. With today's update, all items granted legendary power by the Runecarver in the Helm, Neck, Bracer, Belt, and Ring slots will receive a socket, whether you're creating a brand new item or upgrading an older one.9.2 WoW Shadowlands (How to add Sockets to Season 3 Shadowlands Items)
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