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.