Hi can anyone please help out with command line. it's says enter "1s" after the "$" but it keeps saying command not found

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#1

hi can anyone please help out with command line. is’s says enter “1s” after the “$” but it keeps saying command not found
https://www.codecademy.com/paths/computer-science/tracks/cspath-development-skills/modules/learn-the-command-line-navigation-u/lessons/navigation/exercises/your-first-command

#2

its ls (short for list, with the letter l), not 1s

#3

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