"Barron's AP Physics C (2020) 5th Edition" by Pelcovits and Farkas
Chapter 14 - Analysis of Circuits Containing Batteries and Resistors
Read pages 568-576
(Start at beginning of chapter)
(Stop before "Resistors in Parallel: Equivalent Resistance")
Read pages 590-592
(Start at "Power Dissipated Across Resistors")
(Stop before "Internal Resistance")