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AUCTeX can do syntax highlighting of your source code, that means commands will get special colors or fonts. You can enable it locally by typing M-x font-lock-mode RET. If you want to have font locking activated generally, enable `global-font-lock-mode`, e.g. with M-x customize-variable RET global-font-lock-mode RET.
AUCTeX will indent new lines to indicate their syntactical relationship to the surrounding text. For example, the text of a `\footnote` or text inside of an environment will be indented relative to the text around it. If the indenting has gotten wrong after adding or deleting some characters, use <TAB> to reindent the line, M-q for the whole paragraph, or M-x LaTeX-fill-buffer RET for the whole buffer.