Gateway games generally have simple rules that are easy to teach non-gamers in order to attract new players into board gaming as a hobby. But they are great even for seasoned gamers to start off your game night or play between heavier games.
7 Wonders: Duel
Sushi Go Party!
Imhotep: The Duel
Lost Cities Card Game with 6th Expedition
Isle of Skye: From Chieftain to King
Century: Spice Road
Jaipur (New Edition)
Ticket To Ride
Forbidden Desert: Thirst for Survival
Tokaido: 5th Anniversary Edition