Usages of la asignatura
Esa profesora joven explica muy bien mi asignatura favorita.
That young teacher explains my favorite subject very well.
En esa clase hay personas jóvenes y adultas que estudian la misma asignatura.
In that class there are young people and adults who study the same subject.
En la carrera tenemos una asignatura optativa sobre cambio climático.
In the degree program we have an elective subject on climate change.
Esta asignatura es optativa, pero me parece interesante.
This subject is optional, but it seems interesting to me.
Elon.io is an online learning platform
We have an entire course teaching Spanish grammar and vocabulary.