In the first screen shot you shared it show’s that you have cloned the repository (that is empty initially). You can confirm this by executing “ls” command.
The authenticity of host can’t be established is just a warning, you can safely continue like you have done in the screen shot shared.
also in the second screen shot you shared it seems you made a typo in the name of the repository. It should be “REVIEW” instead of “REVIEWS”. Kindly copy paste the setup commands to avoid being blocked.
Closing this topic as there is no response since last 12 hours. Please feel free to create a new topic and post this question as a reference link in the description of the new topic.