This page discusses possible pitfalls and gotchas. See also the section “Lossage” in the EmacsManual about “dealing with Emacs trouble”.

Emacs key sequences can vary, depending on whether you use an X window system, the console, a terminal emulation, SSH, and so on.

Replace highlighted text with what I type rather than just inserting at point. Add the following to your ~/.emacs file:

    (delete-selection-mode t)

Help versus Backspace keys

The environment may change how the BackspaceKey, ‘C-h’ or ‘F1’ are interpreted.