Docker build webapp-color

Lab 4, Question 8, Hint suggests… docker build -t webapp-color . but when I do this, I get…
unable to prepare context: unable to evaluate symlinks in Dockerfile path: lstat /root/Dockerfile: no such file or directory

you have to perform this task in that directory where Dockerfile is present. or else do
$ sudo docker build --file="<Dockerfile path>" -t < tag-name >

Thanks, I am still trying to get comfortable with these commands. I was able to cd into the webapp-color repo and run the build command there.

I cannot find the path to Dockerfile hence getting the same error
unable to prepare context: unable to evaluate symlinks in Dockerfile path: lstat /root/Dockerfile: no such file or directory

Can you help me find the directory where Dockerfile is stored i tried cd command as well to search but coudnt find Dockerfile in any directory.