Some of us come to software careers with engineering degrees, others find our way through bootcamps and night classes, and more still are self-taught do-it-yourselfers. No matter what your educational path to software development, one question unites us all. "How do I make sure any of this actually works?" This talk, an introduction to a wide variety of testing topics, seeks to arm attendees with enough practical examples to be successful now and enough theory to keep growing. Topics covered include: Unit Testing, Behavior Testing, Double Loop Refactoring & more.