Smart Plugs
Smart plugs are the easiest, cheapest entry point into home automation. Plug one into an outlet, plug a lamp or fan into it, and you've got app and voice control plus scheduling — no wiring, no electrician, usually under $15 a plug.
The main differences between models come down to size (some are bulky enough to block a second outlet), whether they track energy usage, and whether they work over Wi-Fi directly or need a separate hub.
They're also one of the best ways to make 'dumb' devices smart: a coffee maker, a window AC unit, or string lights all become schedulable and voice-controllable with a plug in between.
What to look for
Check the physical footprint
Bulky Wi-Fi plugs can block the second socket on a standard outlet. Look for a low-profile design if you need both outlets available, or choose a model with a pass-through socket.
Only use smart plugs for what they're rated for
Don't put a space heater or other high-draw appliance on a smart plug unless it's explicitly rated for that wattage — check the label before buying.
Wi-Fi vs. hub-based
Wi-Fi plugs work standalone with no extra hardware, which is simplest for a handful of devices. If you're building a larger setup, a hub-based protocol like Zigbee can be more reliable and put less load on your router.
Energy monitoring is a nice-to-have, not a must
Some plugs report real-time power usage in the app. Useful for spotting phantom drain on electronics, but it's not a reason to pay double for a plug.