This is the official manual for the latest Org-mode release.

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Comment lines

Lines starting with zero or more whitespace characters followed by one ‘#’ and a whitespace are treated as comments and will never be exported. Also entire subtrees starting with the word ‘COMMENT’ will never be exported. Finally, regions surrounded by ‘#+BEGIN_COMMENT’ ... ‘#+END_COMMENT’ will not be exported.

C-c ;
Toggle the COMMENT keyword at the beginning of an entry.