How do ants learn?

No freaking idea. There is no individual thought or concern for their own life. Just keep the colony alive.

It's probably learned behavior, I mean when we're kids we don't have individual thought either. What I mean by that is, a lot of people are indoctrinated into whatever religion or values the family holds. Some people break away from it but others don't for a fear of being shunned.

Ants are collective so if they have no individual free will I could imagine the baby just learns by habit and it's pre-instilled in them somehow.

"Baby Ants" ae just eyeless feeding wormy things, they do NOT learn

individual ants Do seem to learn things.
if you look at the colony as an entire being?
that learns too

go to you tube,
type in Edward O Wilson..
get the whole story

Superior beings

Social hierarchy.