These printable PDF documents have instructions related to the basics of Wikipedia.
Wiki markup quick reference – This one-page quick reference (included in the Welcome to Wikipedia brochure) helps you to remember the most frequently used wiki markup codes.
References – This handout explains why references are important, what the expectations for sourcing on Wikipedia are, where to place references, and the basics of adding "ref" tags.
Reference formatting – This handout explains in more detail how to create footnotes for citing sources, and how to cite the same source multiple times.
How to get help – explains the recommended way to get help and feedback. It also includes a glossary of additional help resources you can avail yourself of.
Plagiarism – explains what plagiarism is on Wikipedia—including "close paraphrasing"—in addition to why and how to avoid it.
"Welcome to Wikipedia" gives you a basic introduction into contributing to Wikipedia. You will learn how to create a Wikipedia user account, how to start editing, and how to communicate with other contributors. You will also learn how articles evolve on Wikipedia and how to rate the quality of an existing article. The "Welcome to Wikipedia" brochure contains 17 pages and an additional quick reference that helps you to remember the most frequently used wiki markup commands.
"Ten Simple Rules for Editing Wikipedia" is an editorial published in PLoS Computational Biology that gives advice for scientists (also relevant to other scholars and experts) on how to effectively contribute to Wikipedia.
Evaluating Wikipedia article quality is a reference guide with specific steps you can take to get the most out of Wikipedia, as well as a look at how its quality system works.
Introduction to free licenses helps you understand the basic concepts of free licenses. It explains the idea of free licenses, as well as terms like "CC-by-SA" and "public domain".