Learn French: En traversant la route, tu enlèves tes écouteurs. - While crossing the road, you take off your earphones.

This is part of the gérondif structure you are learning. You take the present tense nous form of the verb (nous traversons), drop the -ons ending, and add -ant. Putting en in front of it creates the meaning "while crossing".

Why use en traversant instead of just saying quand tu traverses?

While quand tu traverses (when you cross) is grammatically correct, using the gérondif (en + present participle) strongly emphasizes simultaneity. It highlights that the two actions—crossing the road and taking off the earphones—are happening at the exact same time.

I noticed enlèves has a grave accent (è). Why is that different from the infinitive enlever?

Enlever (to remove or take off) is a stem-changing verb. For pronunciation reasons, the first e changes to è in the present tense for all subjects except nous and vous. This way, you can clearly hear the vowel sound change when you say tu enlèves.

Does écouteurs mean all types of headphones?

Des écouteurs generally refers to smaller earphones or earbuds. If you are wearing large, over-the-ear headphones, you would usually call them un casque in French, which is actually the same word used for a helmet!