If i play an attack in my turn and deals damage but is blocked (a throw for example) them i recover this with valuable experience, my combat phase ends, them, the rival can play a reversal? And if i a play the attack in the oponent turn as a reversal and i recover with v. experience, what happens with the combat phase condition?

About chop: If i have a ready for anything in my staging area, i play a foundation, then the chop. This chop have the ready for anithing enhance bonus. When this resolves it turns face down and then i play another attack, this attack can have the ready for anything enhance bonus?

If you respond to dealing damage with Valuable Experience, your attack will never reach its Reversal step so your opponent may not attempt a reversal.

If you respond with Valuable Experience on your opponent's turn, it's not your combat phase, so that part of the ability does nothing. You still get the attack back to your hand though.

Chop, once facedown, ceases being an attack, so yes, it will count as a non-attack card for Ready for Anything's enhance. Neat catch!