Hi Sean,

If you want to create a list of strings, you'd need to make sure that each individual item is in quotes. Once you establish that, then each item will be separated by a comma outside of the quotes.

colors = ["red", "orange", "yellow", "green", "purple"]

Your first example (the one without quotes) would work if each item in the list was a variable. But you'd need to assign a value to them first.

red = "red"
orange = "orange"
yellow = "yellow"
green = "green"
purple = "purple"
colors = [red, orange, yellow, green, purple]

Your other example (the entire list of colors inside quotes) is really only creating a list with one item.

colors = ["red,orange,yellow,green,purple"]

# The one item in the list is "red,orange,yellow,green,purple"

Whatever is inside a pair of quotes is considered one item, a single string. So the commas are also included in that string.

Hope this helps.