User:Sj/How to contribute

What contributions are welcome here by the broader community?

How should pages here and on Meta be linked?
Ditto for templates
Ditto for mirrors of common documents like shared policies; which should be canonical, in different contexts? e.g.: UCOC's most up to date version w/ sections and details is on Meta; but the policy sidebar here links to the wmf: page and not meta. While the technical COC link goes to mediawiki, w/ no mirror here.