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How to use Confluence for documenting your work?
About creating and editing pages: https://confluence.atlassian.com/doc/create-and-edit-pages-139476.html
Cooperation and teamwork: https://confluence.atlassian.com/doc/collaborative-editing-858771779.html
Well described how to use Confluence syntax: https://confluence.atlassian.com/doc/confluence-wiki-markup-251003035.html