im not sure how to complete this

There is no space in the code you have shown. But you could easily add a space:

puts "ruby rocks"
puts "ruby" + " rocks" 
puts  "ruby rocks"

However - the function signature has a parameter (rocks). Which suggest you have to do something with that. I cannot tell by your question what problem you're supposed to solve, however - I can imagine it could be something like:

def ruby(rocks)
   puts "ruby #{rocks}"
end

rewatch the video just before that challenge, at the time => 1:35 - 1:55 it explains the how and why.

There is no parameter, you are just joining two strings and printing them. You can use puts to print them, you need to add a plus operator with empty quotes to create a space between the strings.

puts "Ruby" + " " + "rocks!"

You need to add and extra set of elements=> + " " + between ruby and rocks. It would look something like this:

def ruby(rocks) puts "ruby" + "rocks" end

puts "ruby" + " " + "rocks"

the question was, Using string concatenation, join the strings "Ruby" and "rocks!" together. Be sure to include a space between "Ruby" and "rocks!". Then print the result using puts. i still cannot figure out how to complete it.