Please help me to identify the meaning of "rather than", "other than" and "instead of".
Give me several examples to make it clearer.

thank you.
other than

with the exception of

Other than superquntank, no one had thought to ask this sensible question.

(Only superqutaunk thought about it)

rather than
and not

Superqutunk decided to go to the party rather than study English grammar.

(he went to the party, and did not study grammar)

instead of
in place of : as a substitute for or alternative to

Superqutunk wrote in pencil instead of pen.

(He lost his pen, so he used the pencil as a substitute)