Previous definition of was here.

I have 2 warnings before output. What is the problem?

Hello = “Hello, guys!”
Hello2 = nil
Hello2 = Hello
puts Hello2
puts Hello

OUTPUT________________
Variables.rb:7: warning: already initialized constant Hello2
Variables.rb:5: warning: previous definition of Hello2 was here
Hello, guys!
Hello, guys!

Variables that begin with a capital letter are assumed by ruby to be
constants, so you get a warning if you try to change the value. Using
Rails it best to stick to the conventions, so variable names are of
the form name, another_name and so on.

Colin

Thank you a lot!