— Command: back-to-indentation

This command moves point to the first non-whitespace character in the current line (which is the line in which point is located). It returns nil.

— Command: backward-to-indentation &optional arg

This command moves point backward arg lines and then to the first nonblank character on that line. It returns nil. If arg is omitted or nil, it defaults to 1.

— Command: forward-to-indentation &optional arg

This command moves point forward arg lines and then to the first nonblank character on that line. It returns nil. If arg is omitted or nil, it defaults to 1.