Motion by Indent (GNU Emacs Lisp Reference Manual)

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33.17.6 Indentation-Based Motion Commands

These commands, primarily for interactive use, act based on the indentation in the text.

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).

Command: backward-to-indentation &optional arg ¶

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