In which MCU movie is the character Valkyrie first introduced?

Thor: Ragnarok

Which god is depicted with winged sandals? What were James and John's nicknames given by Jesus? What is the total number of squares on a standard Snakes and Ladders board? The traditional American snack 's'mores' usually consist of graham crackers, chocolate, and what other ingredient? What Polish astronomer proposed that the Earth revolves around the Sun?