If you want to be able to open and close your garage door from your phone, and receive alerts on your phone when the door is opened or closed, this Meross Smart Wi-Fi Garage Door Opener is a good choice. It’s about the size of a bar of soap, and attaches to terminals on your garage door motor. (It requires wi-fi reception in your garage, obviously!)
I paid full price for it in November but Amazon currently has it on double discount: a checkbox coupon on the product page and a promo code: ZLUINGM5.