Learning Dapps programing on Mac Catalina

Hi, I am currently learning the Learn how to build Ethereum Dapp and develop for the blockchain @ https://www.freecodecamp.org/news/learn-how-to-build-ethereum-dapp-and-develop-for-the-blockchain/
I have got through setting up my first smart contract. However, when I got the test part I got stuck. My issue is though I have download repo from the link provided. I keep getting no such file the directory error so I cannot pull any of the files using the terminal on my Mac nor can I find a way to move the files so that I can access them in my terminal on my Mac. I am currently on the Catalina on my mini Mac. Any direction on this would be greatly appreciated.