Part 1 Instrumental aspects: deflection sensors force sensors and probing tips implementation into different environments calibration procedures force vs. distance curves elasticity and adhesion measurements determination of friction coefficients 2-d histogram technique. Part 2 Theoretical concepts: forces, elasticity and adhesion viscosity Amontons laws adhesion model atomic-scale stick-slip. Part 3 Tribological experiments on the nanometer-scale: contrast mechanisms of friction force microscopy lubrication studies by friction force microscopy nanometer-scale modifications wear mechanisms conclusions and outlook.