Anyone know how to make a lead in minecraft?

two things before you rely on them: they snap if the animal gets more than about ten blocks from you, so don't sprint ahead. and villagers can't be put on a lead at all, people try that a lot when moving them to a trading hall.

four string and a slimeball and you get two leads out of it. 1.21 hasn't changed that. slime is the annoying half - swamps after dark, or dig out a slime chunk. and if a wandering trader turns up, his llamas are on leads and those drop.