A how-to is an informal, often short, description of how to accomplish a specific task. A how-to is usually meant to help non-experts, may leave out details that are only important to experts, and may also be greatly simplified from an overall discussion of the topic.
One of the earliest how-to books was published in 1569 by Thomas Wight and entitled, A booke ohrijf the arte and maner, how to plant and graffe all sortes of trees: With divers other new practise, by one of the Abbey of Saint Vincent in Fraunce by Leonard Mascall.
In the modern era How-to can range from brief directions that aid in performing a task with which one is unfamiliar to full-length books, generally intended to assist or inspire life-changing methods and attitudes. They occur in the "self-help" genre, business books, and the hobby industry.
Perhaps the best known full-length book in the genre is How to Win Friends and Influence People, written by Dale Carnegie in 1936.
A similar concept can be seen in many of the [topic] For Dummies series of tutorials and also in many other introductory surveys entitled with the suffix "101" (based on academic numberings of entry-level courses).
step one, head to a seedy part of town.
pull to the curb and look around
once you found one who looks alright
pick up the lady of the night
take her back to your hotel room
break off the handle of a broom
lay some plastic on the floor
creep up behind the dirty whore
hit her with the broom until she's dead
then dump the body but keep the head
no one will ever know who took her
now you know, how to kill a hooker
how to kill a hooker x2