Key bindings

• How do I bind keys (including function keys) to commands?
• Why does Emacs say ‘Key sequence XXX uses invalid prefix characters’?
• Why doesn’t this [terminal or window-system setup] code work in my init file, but it works just fine after Emacs starts up?
• How do I tell what characters or symbols my function or arrow keys emit?
• How do I set the X key “translations” for Emacs?
• Why does the Backspace key invoke help?
• How do I swap two keys?
• How do I produce C-XXX with my keyboard?
• What if I don’t have a Meta key?
• What if I don’t have an Escape key?
• Can I make my Compose Character key behave like a Meta key?
• How do I bind a combination of modifier key and function key?
• Why doesn’t my Meta key work in an xterm window?
• Why don’t some keys like C-. work on xterm?