You cannot make a candle holder from molding clay on Yom Tov.

You cannot make charcoal on Yom Tov. You cannot split a wick to make two, on Yom Tov because you would be making a utensil.

Reb Yehuda says you can split a wick with fire when you want both to be lit at the same time. This refers to a case where you put a wick in two cups and you light it in order to light both cups.

Beitzah 4:5

You cannot break an earthenware utensil or cut a piece of paper to roast a salted fish. You cannot clean an oven from ashes but, you can pat down the ashes.

You cannot put two barrels together and a pot across the top as it looks like building. Similarly, you cannot hold up a pot with a piece of wood.

You are not allowed to lead an animal with a stick on Yom Tov (by hitting it).

R’ Elazer birebbe Shimon permits this.