Where to get help with Google Sheets

Google's Getting started guide:

https://support.google.com/drive/topic/20322

Google's own help pages for sheets

https://support.google.com/drive/topic/20322?hl=en-GB&ref_topic=2811806

The Google Docs product forum: 

https://productforums.google.com/forum/#!forum/docs
This has questions and answers about all types of Google Drive/ Google Docs files.

StackExchange Webapps GoogleSheets category

http://webapps.stackexchange.com/questions/tagged/google-spreadsheets

Note: answers here tend to follow the most-generic, most-complicated approach to finding a solution, and you will often by told to use a script when this is not strictly necessary. But it's an excellent place for getting scripting help.

Excel Help Forum

http://www.excelforum.com/for-other-platforms-mac-google-docs-mobile-os-etc/
This privately-run forum has a thread for other spreadsheet tools, including Google Docs.

What other help sites have you found?   

Leave a comment below, and I'll add them to the list.