Not all lecture notes are created equal. You want to look for notes from established universities, specifically those tailored for (often labeled "Physical Chemistry II" or "Quantum Chemistry") or Chemical Physics programs.
Do not just read the PDF. Copy the derivations of the particle-in-a-box energies, the harmonic oscillator ladder operators, and the hydrogen atom radial equation. Muscle memory builds intuition. quantum chemistry lecture notes pdf
: Demonstrated that light behaves as particles (photons). Not all lecture notes are created equal
: A structured summary from Prof. Reiher's lectures focusing on molecular properties, reaction energies, and the Modern Methods and Algorithms of Quantum Chemistry the harmonic oscillator ladder operators
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[ \psi_\pm = \frac1\sqrt2\pm 2S (\phi_1s_A \pm \phi_1s_B) ]