I am using Emacs 26.3 with macos Catalina and I would like to type the inverted exclamation point and question mark characters. Can someone point me to a link that will get me started towards understanding how to input special characters not available on my standard MacBook Pro keyboard.
Short answer: C-u C\ spanish-prefix RET. The characters you mentioned can then be typed as
~? => ¿
~! => ¡
Long answer: read the emacs documentation starting at Language Environments, plus the description of 'spanish-prefix' in lisp/leim/quail/latin-pre.el to see what other characters that method supports, and to see what other input methods are available, such as catalan-prefix and spanish-keyboard.
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The linked documentation plus the section that follows on Input Methods were very helpful.– pajato0Oct 21 '19 at 7:55
counsel-unicode-charwill help you finding more exotic chars via completion. Pretty neat.