Compilation of my favorite online STEM content creators:

Tech Ingredients - Laser physics, machining, chemistry, drones, and so much more. 100s of hours of educational STEM entertainment

Applied Science - Popular materials science applications from the brilliant @BenKrasnow

Sam Zeloof - Plasma physics, semiconductor research, and materials science... from a brilliant high school student!

Dan Gelbart - Outstanding video series from an expert in prototyping and precision machine design

Applied Ion Systems - High Vacuum plasma physics on a hobbyist budget

EnCodeVentor - Tutorials on Molecular Dynamics simulation and coding with LAMMPS, OVITO, and Python

This Old Tony - Hilarious and informative machine shop and fabrication videos

Two Minute Papers - Video showcase of research papers, especially in the fields of simulation, machine learning, image processing

Titans of CNC Academy - Free video series to learn CAD, CAM, and CNC machining, mostly with Autodesk Fusion360

Colin Furze - Wildly entertaining inventor of electromechanical contraptions, giant robots and absurb vehicles

Proto G Engineering - Mix of hobbyist and professional electronics fabrication, robot prototyping, and manufacturing methods

Engineer Guy - Excellent explanations of engineering concepts for both laymen and experts

Physics Anonymous - Design of custom machining and lab equipment

Click Chemist - Computational chemistry visualizations, density functional theory

Thang Mechanisms - Extensive collection of CAD mechanisms and visualizations

NileRed - Hobbyist chemistry experiments, synthesis and reactions

Adam Bender - Mechanical Design tips and similar website