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"Netiquette" is network etiquette, the do's and don'ts of online communication. Netiquette covers both common courtesy online and the informal "rules of the road" of cyberspace. This page provides links to both summary and detail information about Netiquette for your browsing pleasure.
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This is mostly pretty basic stuff but definitely worth being aware of and striving to comply with. I was afraid it would be stuff like "top posting is bad!" which is hugely contentious, but instead it's truly universal stuff, which is good.