I recently ran across this old post from Emacs master Mickey. In it, Mickey explores ways to enter diacritical marks in Emacs. For example, if you want resume to be rendered (properly) as résumé you need to know how to convince Emacs to do that.
It turns out that there’s at least three ways of doing it. To get the ‘é’ character, I usually just type 【Ctrl+x 8 ' e】 but I could also type 【Ctrl+x 8 Return】 LATIN SMALL LETTER E ACUTE or if I know the codepoint, 【Ctrl+x 8 Return】 e9.
If you’ve used Emacs for any length of time and needed to enter diacritical marks, you’re probably familiar with these methods. Mickey has a third way that I didn’t know about: you can use multilingual text input along with TeX input mode. If you’re writing a document with a lot of diacriticals, this method may be your best bet. Head on over to Mickey’s post for the details.