Racquets What Is The Difference Between Performance And Recreational Tennis Racquets?

What is the difference between performance and recreational tennis racquets? - racquets

I do not know what are the differences. I mean bat from $ 20-500 and I think we are all equal. Moreover, as to know whether a string pattern racquet is opened or closed by putting them into action? Where do the most between the network and the crosses that it is open? Finally, what is the beam a tennis racket?