Lists are 1-indexed. ipairs walks them.

Goal

Print the first city (index 1).

local cities = {"Nairobi", "Mombasa", "Kisumu"}
print(cities[1])
print(#cities)

local cities = {"Nairobi", "Mombasa"}
cities[#cities + 1] = "Kisumu"
print(cities[3])

local units = {12, 8, 5}
print(table.concat(units, ", "))

print(({"Nakuru", "Eldoret"})[2])