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Falsification
Popper develops and publishes the concept of falsifiability in his book The Logic of Scientific Discovery. (Zalta)
https://www.youtube.com/watch?v=wf-sGqBsWv4&ab_channel=BBCRadio4 -
Psychoanalysis
Popper criticizes Fruedian psychoanalysis in his 1938 paper Constructions in Analysis. (Grant) -
Historicism
Popper criticizes historicism in his publication The Poverty of Historicism. (Popper) -
Truthlikeness
Popper's book Conjectures and Refutations argues that theories should be accepted only if they have the highest degree of "Truthlikeness", a combination of truth and content. (Zalta)