guide
n. countablen. a person who shows you the way or explains things about a place. It can also be a book or a set of instructions that helps you learn how to do something.
n. a person who leads or directs others on a journey or through a location; alternatively, a book or document providing information or instructions. Often used to describe a professional who provides historical or cultural context to tourists.
The tour guide showed us the oldest buildings in the city.
We followed the hiking guide through the forest to ensure we stayed on the correct path.
The comprehensive field guide provides detailed illustrations and descriptions to help amateur birdwatchers identify local species during the spring migration.
Often takes the preposition 'to' when referring to a book or manual ('a guide to gardening').