(Explaining the classifications of golems found all over the world.)
There are various types of golems found in this world. A golem can be made out of any element found in this world.
(I am talking about the physical elements that are defined in the periodic table of elements… and other magical elements like mithril, orichalcum, etc. that are unique to this world… If you don't remember the periodic table… go back to school!!)
Golems can be made out of nearly any alloy or pure element. It doesn't even need to be a proper solid shape, you can make a golem straight out of thin air too.
Like literally, just use Hydrogen or any other gas present in the air and make a golem out of it.
(Although it's extremely difficult but some wind magicians have succeeded in doing this ridiculous thing before…)