This is the 123rd most frequent Hungarian word.
beszélt
"Spoken" or "talked."
The word 'beszélt' in this context is in the past tense, singular third person form of the verb 'beszél', indicating an action of speaking by the teacher about a specific topic.
A tanár beszélt a nyelvtan fontosságáról.
The teacher spoke about the importance of grammar.
Here, 'beszélt' is used in past tense, singular third person to describe Peter speaking about a subject, connected to the main clause indicating hearing it.
Hallottam, ahogy Péter az új projektről beszélt.
I heard Péter talking about the new project.
The word 'beszéltünk' is derived from the verb 'beszél', meaning 'to speak' or 'to talk'. Here it is used in past tense in the plural form, 'we talked', to indicate a mutual conversation.