Learn Spanish (Spain): Hoy he venido andando.

In Spain, when an action happens in a time period that isn't finished yet, like hoy, esta semana, or este mes, you use the present perfect (he venido). In English, we often use the simple past for this, but in Spain, using vine with hoy sounds unnatural.

Why does the sentence use andando instead of a pie for on foot?

Both a pie and andando (the gerund or -ing form of andar, meaning to walk) are correct. However, in spoken Spanish, it is incredibly common to express how you traveled by using the gerund. You are literally saying I have come walking.

Is there a difference between using andando and caminando here?

They are synonyms, but in Spain, ir andando (to go on foot) and venir andando (to come on foot) are the standard everyday phrases. Caminando is also understood but can sound a bit more formal or focus heavily on the physical exercise of walking rather than just the method of transport.

Can I use this same structure with other ways of moving?

Yes! Using a gerund right after a verb of motion is the standard way to explain how you traveled. For example, you can say he venido corriendo (I came running) or ella salió conduciendo (she left driving).