If you find the "Switching Power Supply Design Optimization" PDF, focus on these high-value sections:
In high-frequency optimization, the proximity effect (current crowding in adjacent layers) can skyrocket AC resistance. Maniktala advises: Using Litz wire or foil windings
Most engineers believe that increasing the switching frequency makes a power supply smaller. That is true—until it isn't. The Core Thesis: Optimization via the "Switching Loss"
Maniktala dedicates significant space to the Optimization Point. If you plot switching frequency (Fsw) on the X-axis and total losses on the Y-axis, you get a U-shaped curve. you get a U-shaped curve.
The "Optimization" in the title refers to finding the exact bottom of that U-curve. The book provides the exact mathematical frameworks (specifically the "Optimum Frequency" equations) to do this without guesswork.