World Class basics? That's a good question.
I'm not sure how I should limit this, but I'll give a rough first pass:
1) Continental-grip serve with decent racket drop.
2) Unit turn on both sides.
3) Topspin drives both sides.
4) Continental grip volley.
5) Split-step footwork.
Those seem too general, but I have an idea in my mind about what I'm looking for. I mostly focus on visual patterns at this point. I'm looking for a certain general form (I use video) and then try to develop drills for the student to adapt to that form.
I've coached high school tennis in the past and given lessons to friends and family. I've been a professional educator and am sort of a tennis fanatic.