Ok the objective of tennis is to hit a ball over the net and in the court and make it bounce twice on there side.
I have learnt technique by just watching pro's on TV. That has helped me. Just keep it simple and that works for anyone.
I had loads of golf lessons after getting a handicap of 8 by myself, and they just made my brain go into over drive and I lost the simplicity of the game.
Technique: you ever have it or you don't, it can't be taught properly imo.