Сегодня я впервые поехал на метро.

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Breakdown of Сегодня я впервые поехал на метро.

• на: by
• сегодня: today
• поехать: to go

Questions & Answers about Сегодня я впервые поехал на метро.

Why is it поехал, not ехал or ездил?

Поехал is the past tense of a perfective verb and usually means set off / went by vehicle, with focus on the start of the trip or the fact that it happened as a single completed event.

In this sentence, Сегодня я впервые поехал на метро means something like Today I went by metro for the first time.

Compare:

• ехал = was going / went by vehicle, often describing the trip in progress
• поехал = set off / went by vehicle, a single completed event
• ездил = went / used to go / made a trip there and back, often about experience or repeated trips

So поехал sounds natural here because the speaker is talking about a first-time event that happened today.

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Why do we use на метро, not в метро?