Through this lecture, students can explain First Degree First Order PD: Formation of PD, Separation of Variables, Homogeneous, Linear, Exact and Inexact; First Degree First Order PD Applications: Trajectories and Electrical Circuits; Homogeneous Linear PD with Constant Coefficients: Second Order, nth Order, Second Order Special Type (Euler-Cauchy and Legendre); Non-Homogeneous Linear PD with Constant Coefficients: Undetermined Coefficients, Inversion Operators, Parameter Variation, Simultaneous Linear PD; First Degree Second Order PD Applications: Oscillations and Electrical Circuits;