Itinerante translates to "itinerant" or "nomadic". It's a less common, more evocative word than simply saying "traveling" or "moving".
In the song, Lali sings about "esta vida itinerante" (this itinerant life), suggesting a life that is constantly moving or changing. It adds a poetic depth to the idea of love being a constant amidst a life that is always in flux, making it a memorable and interesting choice.
"Incondicional" is Lali's statement about loving without conditions or baggage. She opens by refusing to carry old chains into the relationship, since freedom for both people is what lets her love fully.
The verses admit that past mistakes shaped her ("trial and error"), but she doesn't let that make her guarded. The hook repeats "incondicional" (unconditional) as a promise: her door stays open no matter how late he arrives, and she sees him reflected in her own gaze whenever she looks in the mirror.
By the final chorus the song settles into simple devotion. No terms, no negotiating, just two people choosing each other.