Smart kitchen appliances give home cooks an edge in a number of ways. First, when you connect a kitchen gadget to your smartphone, you can more easily schedule when something should start cooking and monitor its progress remotely. For example, if you have a smart coffee maker, you can set it to start brewing a cup when you say “Alexa, good morning.” Another advantage is that many smart kitchen gadgets, like the Anova sous vide, have recipes built into its app, which takes the guesswork out of knowing how long you need to cook a steak to make sure it’s perfectly medium rare.  From Instant Pots to coffee makers to home beer-brewing machines, here are our favorite smart kitchen gadgets. “Sous vide” is a process in which you vacuum-seal something — say, a steak — in a plastic bag, then immerse it in a hot water bath for a long time. This low-and-slow cooking method results in amazingly tender and juicy meat. Anova’s Nano Precision Cooker takes the guesswork out by connecting to your smartphone via an app, and alerting you when your food is ready. Plus, the app has recipes and tips from Serious Eats, one of the better cooking sites online. The Blue...