Maybe you’re thinking about writing a screenplay, but don’t know where to start. Or maybe you’re interested in following in the footsteps of writer-directors such as Mindy Kaling or Jordan Peele.

In her new book, Syme's Letter Writer, Rachel Syme of The New Yorker explains how to write a delightful letter to a loved one. Unlike texting and email, old-fashioned letters, hand-addressed and sent ...