Installing ruby is quite tricky initially, suggest research rbenv tool. Suggestion- be very sure how you will uninstall if necessary, before you start installing stuff.
Everything seems a bit easier on Ubuntu imho, normally use macos
For further actions, you may consider blocking this person and/or reporting abuse
Try Ruby Monk
rubymonk.com/
also LaunchSchool has very good free Ruby resources, and is excellent generally
launchschool.com/books/ruby
Installing ruby is quite tricky initially, suggest research rbenv tool. Suggestion- be very sure how you will uninstall if necessary, before you start installing stuff.
Everything seems a bit easier on Ubuntu imho, normally use macos