In this text, it is concerned with simplification of Quantum chemistry to be world wide use. Also in this text, I concern with all types of quantum calculations starting from the empirical calculations to ab nitio calculations as well DFT density functional theory. Also, in this text I concern with the atomic history from Dalton model to the quantum theory. The text contains information about the electromagnetic waves as well the laser technique. The text includes explicit derivation of the Eigenfunctions of the atomic orbitals and finally, the reader will acquire good information about the atomic orbitals hybridization, molecular orbits of the molecules in addition to the definition of oxidation and reduction of molecules according to quantum MO Point of view.