Like in Shadowlands if you do not like your weekly vault rewards you can instead choose to take tokens.
Two tokens per slot unlocked up to a maximum of 6 tokens, NPC near the vault sells the socket item that can be used on a helm, neck, bracer, rings, waist, same slots as SL. You cannot use a socket item on a piece of equip that already has a socket on it of course.
Sockets cost 6 tokens each.