When you edit files of text in a human language, it's more convenient to use Text mode rather than Fundamental mode. To enter Text mode, type M-x text-mode.
In Text mode, only blank lines and page delimiters separate paragraphs. As a result, paragraphs can be indented, and adaptive filling determines what indentation to use when filling a paragraph. See Adaptive Fill.
Text mode defines <TAB> to run
(see Indentation), so that you can conveniently indent a line like
the previous line.
Text mode turns off the features concerned with comments except when you explicitly invoke them. It changes the syntax table so that single-quotes are considered part of words. However, if a word starts with single-quotes, these are treated as a prefix for purposes such as capitalization. That is, M-c will convert ‘'hello'’ into ‘'Hello'’, as expected.
If you indent the first lines of paragraphs, then you should use Paragraph-Indent Text mode rather than Text mode. In this mode, you do not need to have blank lines between paragraphs, because the first-line indentation is sufficient to start a paragraph; however paragraphs in which every line is indented are not supported. Use M-x paragraph-indent-text-mode to enter this mode. Use M-x paragraph-indent-minor-mode to enable an equivalent minor mode in situations where you can't change the major mode—in mail composition, for instance.
Text mode, and all the modes based on it, define M-<TAB>
as the command
ispell-complete-word, which performs completion
of the partial word in the buffer before point, using the spelling
dictionary as the space of possible words. See Spelling. If your
window manager defines M-<TAB> to switch windows, you can
type <ESC> <TAB> or C-M-i.
Entering Text mode runs the hook
text-mode-hook. Other major
modes related to Text mode also run this hook, followed by hooks of
their own; this includes Paragraph-Indent Text mode, Nroff mode,
TeX mode, Outline mode, and Message mode. Hook functions on
text-mode-hook can look at the value of
see which of these modes is actually being entered. See Hooks.