Not sure about deleting the library folder. Doing so caused me to have to re-associate the assets for the project. It took me a while to figure out that because my terminal asset was outside of my project folder, it wasn’t being automatically restored. I had originally as instructed simply imported it from the source folder.
I recommend that you change the course to say, “Zip the project folder up, then go ahead and remove the library folder from the zip file in order to save space on GitHub or for whomever you may be sending your project sources.”