I was curious too. See https://www.polishandlather.com/blogs/news/13264093-what-do-...
I've always liked the home made stuff you find at street and farmers markets; bigger variety in scents for sure.
Also thinking about the soap making process makes me think of Fight Club.
So basically I've actually been washing with "bath bars/liquids/detergents" instead of actual soap.. uhmmm
I usually read the ingredients on pretty much everything I buy, but I always thought "lauryl sulphate*" stuff and palmitate oil and others where just industrial versions of fatty acids in regular soap...I guess I was wrong.