if you read the link he gave, it has a really good description of each...

but to summarize...

A tutorial: - is learning-oriented - allows the newcomer to get started - is a lesson

A how-to guide: - is goal-oriented - shows how to solve a specific problem - is a series of steps

Level of previous knowledge assumed, tutorials tend to be more "starting from zero", and scope, guides tend to have a narrower focus.

A tutorial is to an integration test what a how-to guide is to a unit test.

Think of how tos as recipes for different scenarios