Keller’s chapter is not simply an introduction to Foucault but a compact methodological map for reading modern formations of truth. Foucault breaks with the idea that knowledge stands apart from power. Discourses do not only represent objects; they constitute objects, delimit what may be said, organise institutions, distribute authority and produce subjects capable of recognising themselves inside specific regimes of truth. Keller presents Foucault as an experimenter rather than a system-builder. This distinction is decisive: Foucauldian work does not begin with a doctrine to be applied; it enters an archive, traces historical conditions, and emerges with concepts altered by the encounter. The chapter clarifies the passage from archaeology to genealogy. Archaeology studies the rules of formation that make statements possible within particular epistemic arrangements. Genealogy intensifies the political dimension by asking how practices, institutions, bodies and knowledges become connected through power. Modern subjectivity is therefore not a natural interior essence waiting to be expressed but a historically produced position: the patient, the delinquent, the sexual subject, the citizen, the expert, the normal individual. Power is productive because it fabricates categories, habits, visibilities and self-relations. It does not only repress; it composes the field in which freedom itself becomes thinkable.