Thank you both
He learned the wave trick in 1 training session.
He also learned shake in 1 training session.
Target training didn't take long either, nor did "step up". 1 session as well. (were like 5-10min sessions)
I haven't had the time to teach him anything new lately though.
But he seems like a fast learner.
Ive only had him for like 5 months now. He was an aviary bird in bad condition (I saved him). Took a while to gain hes trust, at first he was frightened of everyone. Squawking at anyone that was 1meter away from his cage. Now hes very tame. He doesn't bite/or squawk (only when hes excited). In that time frame, he started to pick up on words "hello" "whats that" and hes still learning (saying lots of gibberish). He has a very clear voice which is also very sweet.
He knows what no means. (say that when he tries to climb up the curtains) tell him no and he climbs back down.
I would say he is intelligent, but then again I haven't meet other parrots such as african grey, etc.