Some simple remarks on the basis of transport theory.- Entropy, dynamics and scattering theory.- Response, relaxation and fluctuation.- Fluctuating hydrodynamics and renormalization of susceptibilities and transport coefficients.- Irreversibility of the transport equations.- Ergodic theory and statistical mechanics.- Correlation functions in Heisenberg magnets.- On the Enskog hard-sphere kinetic equation and the transport phenomena of Dense simple gases.- What can one learn from Lorentz models?.- Conductivity in a magnetic field.- Transport properties in gases in the presence of external fields.- Transport properties of dilute gases with internal structure.