This is a great article! I believe there is an error here:
" Modern Linux systems use systemmd to choose a run level instead. According to TecMint, these are the available run levels:"
I believe that should be systemd not systemmd.
should I open a PR? will that article be here: GitHub - freeCodeCamp/freeCodeCamp: freeCodeCamp.org's open-source codebase and curriculum. Learn to code for free.?