2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/67226Random walks in random environments (RWRE's) have been a source of surprising phenomena and challenging problems since they began to be studied in the 70's. Hitting times and, more recently, certain regeneration structures, have played a major role in our understanding of RWRE's. We review these and provide some hints on current research directions and challenges.Probability60K37, 82C44text