Any pilot that thinks flying [learning] starts after PPL has doubt in his/her personal aviation capabilities.
On the contrary, there is no possible way during 45 or so hours of formal flight training to encounter all the possible situations, conditions, and aircraft from which one will truly learn to fly. A PPL means that you
met the minimum standard for piloting, not much more. After a few hundred hours, you'll be getting there, after a thousand, call yourself an experienced pilot. You will not be better than the instructor who trained you, and how many of them have a thousand hours? Too few.... A fresh PPL is not yet an experienced pilot, particularly if they have yet to fly with one! Have confidence in your aviation capabilities, those demonstrated for the PPL exam, but know how many you have yet to develop, which were not even
mentioned during your PPL training.....
Do not wave your fresh PPL at the sky, and say "I've got you conquered", hold it with pride and humility and say "I'd like to tip toe up with care".