The best “good luck” wishes express your genuine feelings and show the recipient you have them in your thoughts. Admittedly, it’s easy to get stumped when writing “good luck” messages.

As Conan O’Brien prepares to kick off the 97th Academy Awards as a first-time host, his friends in late-night are rooting for him. Jimmy Kimmel, who hosted the last two years’ Oscars, had help ...