Informal giving elementary instruction in some handicraft, hobby, etc.: a how-to book
See how-to in American Heritage Dictionary 4
adjective
Offering practical advice and detailed instruction in an activity.
nounpl.how-tos
Something, such as a book or learning situation, that provides practical advice and detailed instruction in an activity: She read a how-to on plumbing. The weekend was a real how-to for would-be campers.