I know that I know nothing
Acatalepsy
Academic skepticism
Metamemory
Apodicticity
Cogito
Dunning–Kruger effect
Doxastic logic
,
Doxastic attitudes
Epistemology
Gnothi seauton
Ignoramus et ignorabimus
Intellectual humility
Maieutics
Münchhausen trilemma
Pyrrhonism
Sapere aude
Skepticism
There are unknown unknowns
Tractatus Logico-Philosophicus
https://en.wikipedia.org/wiki/I_know_that_I_know_nothing