Importance of catalysis in science and industry; understanding how the catalysis works; basic concepts, terms and definitions in catalysis; classification of catalysis: Homogenous and heterogenous catalysis; understanding the mechanism of catalysis; Using transition metal nanoparticles as catalyst; problems with the transition metal nanoparticles; supported transition metal nanoparticles; confinement of transition metal nanoclusters in porous materials; reusability problem in the transition metal nanoparticles; metal-ligand interaction versus metal-metal bond; metal-ligand interactions; understanding the importance of metal-ligand interaction in catalysis; key reactions in catalysis; catalytic cycles for selected reactions.