Step: Object field: .foo

.foo returns the value at key foo, or null if the key is absent.

{"make": "Nissan", "model": "Kicks"} | .make   # => "Nissan"

Pitfall: .foo only works for identifier-like keys (letters, digits, _). For keys with dashes or spaces you need the bracket form you'll see in a couple of steps.

Your turn: get the person's firstName.