How do I find help for point command `.` in *nix?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Hypnotic Puzzle2

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Chapters
00:00 Question
00:33 Accepted answer (Score 80)
01:48 Answer 2 (Score 24)
04:15 Answer 3 (Score 6)
05:12 Answer 4 (Score 4)
05:37 Thank you

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Full question
https://superuser.com/questions/1306726/...

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Tags
#linux #unix

#avk47