This work comprises an investigation about basic Quantum Mechanics (QM) teaching in the high school. The organization of the concepts does not follow a historical line. The Path Integrals method of Feynman has been adopted as a Reference Conceptual Structure that is an alternative to the canonical formalism. We have designed a didactic sequence for teaching the basic ideas of Quantum Mechanics according to our theoretical frame (Otero, 2006), eluding the mathematical formalism and using simulation software. In the first part of this work we show our proposal for teach the quantum character of the electrons. At the end, we present the outlines of an approach the quantum character of the light with students of the secondary school, where also we use Feynman's technique as the most universal explanation of the light.