Student or Learner
What is the difference between "Did you ever hear of" and "Have you ever heard of"?
I remember reading in a grammar book that the former is just a replacement of the latter.
23p)Did you ever hear of Douglas Engelbart? His simple invention changed the way computers work...
"Did you" is more common in AmE, but we also use "Have you ever" which is more suited to the meaning of the question, really.