We're already able to describe what people do, we've been able to do that since spanish 1 when we learned about conjugating verbs to match different people. But now we're going to be able to talk about what people have done, as in, in the past. This is definitely going to open up a whole lot of new doors for describing actions and telling stories.
Change AR verbs to be in the preterite tense (past)
For a further explanation of -AR, -ER, and -IR verbs in the past click here.