How Things Work - 42 free documentaries about materials & chemistry.
Start with I got buried in concrete to explain how it works (24 min, Veritasium), then Can you actually smell metal? (31 min, NileRed). All 42 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on materials & chemistry is Stuff Matters by Mark Miodownik.