Book:
University Physics II - Thermodynamics, Electricity, and Magnetism (OpenStax)
Chapter 5.2: Electric Charge and following
Exercises:
University Physics II - Thermodynamics, Electricity, and Magnetism (OpenStax)
Chapter 5.10: Electric Charges and Fields (Exercises)
Task No. 4, 5, 20, 21, 23, 32, 48, 60, 62, 94, 100
PhET Animation on E-Fields
https://phet.colorado.edu/sims/html/charges-and-fields/latest/charges-and-fields_all.html