These are helpful resources that I have used to learn more about electronics.
Resources for Learning Electronics
Books:
History: Faraday Maxwell and the Electromagnetic Field, The Chip: How Two Men Invented the Microchip, The Forgotten Genius of Oliver Heaviside, Much Ado About Almost Nothing: Man's Encounter with the Electron
Theory: Purcell Electricity and Magnetism, Introduction to Electrodynamics (Griffiths)
EMI: Electromagnetic Compatibility Testing (Ott), Noise Reduction Techniques (Ott), High-Speed Signal Propagation: A Handbook of Black Magic
Circuits: Art of Electronics, Practical Electronics for Inventors, Operational Amplifier and Linear Integrated Circuits (Fiore), Microelectronics (Neamen), Microelectronics (Sedra and Smith), Linear Circuit Analysis (Davis)
Power Electronics: Fundamental of Power Electronics (Erickson), Principles of Power Electronics (Kassakian), Elements of Power Electronics (Krein)
Analog Design: Analog Circuit Design: Art, Science, and Personalities (Williams)
Controls: Control Systems Engineering (Nise)
RF: The Electronics of Radio (Rutledge)
YouTube Channels:
Learn Electronics: Ali Hajimiri (Caltech Professor), EEvlogs, bigclivedotcom, MIT OpenCourseWare, Neso Academy, Electronoobs, Ben Eater, Mr. Carlson's Lab, Practical Engineering, Simply Electronics, The Engineering Mindset, Adafruit, Professor Katherine Kim, Professor Sam Ben-Yaakov, ElectrArc240, Electronic Wizard, Electronic Minds, IMSAI GUY, James Sharman, The Signal Path
Project Focused: GreatScott, William Osman, Joe Grand, Jeri Ellsworth, Louis Rossmann, James Bruton, Maker's Muse, PeterStripol, Marco Reps, Zach Freedman, Carl Bugeja, The Plasma Channel, Birdbrain, Sine Lab, The AudioPhool
Altium/PCB Design: AltiumAcademy (especially Eric Bogatin and Rick Hartley), Phil's Lab, Robert Feranec
Controls: Brian Douglas
Forums: Reddit (/r/electronics, /r/electricalengineering, /r/printedcircuitboard, /r/ECE), EEVblog Forum
Podcasts: The Amp Hour, Pick & Place Podcast, Circuit Break Podcast, Unnamed Reverse Engineering Podcast, Power Up