This version is used to look at the contents of a shell varaible. In this case, the contents of the PATH variable are displayed.
echo 'Show me the money' > cash.out
This version shows how echo can be used to put text into a file. The greater than sign > is a shell redirection, which causes the output of a given command to be redirected into the specified file. The output of echo is thus redirected into the file named cash.out.
echo can be used to set terminal settings. If you use the hat character, shift 6 key on US English keyboards, this sequence will not reset a foobared terminal. The hat character repersents the escape character, ASCII 27. The control key and [ key are used to create the escape character.