The content of a talk depends very strongly on the audience and the effect you want to produce.
Once I gave a talk on fundamental methods (as in, introductory methods, almost at a remedial level) for producing high quality source code in computer programming. Things like variable names and using white space to improve readability and such. Real basic stuff, leading up to the basics of code arrangement, routine style, etc. All very basic stuff that I noticed people did very poorly when I did code review.
My first slide was a picture of a beach in the tropics. My opening few lines of my talk was about the surfing guru who accepted a student. The first thing the student was required to do was swim the reef. He had to go snorkeling and find out where the water was deep and shallow, how the level changed, and where the jagged coral was that would rip you apart if you fell on it. That is, the underlying fundamentals. And today we would "swim the reef" of computer programming.
Maybe you don't want exactly that. But you do want to select an opening slide that matches the goals of your talk, judged according to audience, the venue, and the general nature of the conference.