Just my interpretation from Wikipedia descriptions:
- Tutorial: Set of videos, quizes or wizards may work.
- User guide: Product manual, set of instructions, warnings, etc.
- How to: Specific task descritpion. May be one step-by-step instructions to complete a task.
Short descrition of each:
- Tutorial: Interactive set of instructions to teach by example in
certaing area of knowladge.
- User Guide: A manual written by technical
writer intended to give assistance to users. May include include
screenshots and diagrams.
- How to: Simplified and short description of
how to accomplish some specific task meant to help non-experts.
A tutorial is one method of transferring knowledge and may be used as a part of a learning process. More interactive and specific than a book or a lecture; a tutorial seeks to teach by example and supply the information to complete a certain task.
Depending on the context a tutorial can take one of many forms, ranging from a set of instructions to complete a task to an interactive problem solving session (usually in academia).
A user guide or user's guide, also commonly known as a manual, is a technical communication document intended to give assistance to people using a particular system. It is usually written by a technical writer, although user guides are written by programmers, product or project managers, or other technical staff, particularly in smaller companies.
User guides are most commonly associated with electronic goods, computer hardware and software.
Most user guides contain both a written guide and the associated images. In the case of computer applications, it is usual to include screenshots of the human-machine interface(s), and hardware manuals often include clear, simplified diagrams. The language used is matched to the intended audience, with jargon kept to a minimum or explained thoroughly.
A how-to or a how to is an informal, often short, description of how to accomplish some 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.