Mailing lists

edx-code mailing list: https://groups.google.com/forum/#!forum/edx-code

openedx-ops mailing list: https://groups.google.com/forum/#!topic/openedx-ops/

IRC channel

#edx-code on irc.freenode.net

logs: https://botbot.me/freenode/edx-code/

Documentation 

Official docs: http://docs.edx.org

Open edX official site: http://open.edx.org

Readthedocs: http://edx.readthedocs.org/projects/

edx-platform Github wiki pages: https://github.com/edx/edx-platform/wiki

configuration Github wiki pages: https://github.com/edx/configuration/wiki

Confluence wiki: https://openedx.atlassian.net/wiki/

Videos

open.edx.org: https://open.edx.org/videos

Appsembler videos on Youtube: https://www.youtube.com/channel/UCINXF1QU7s1D4Tvp0AnWPKA

Youtube: https://www.youtube.com/results?search_query=open+edx