I'm currently studying linear algebra all over again, but when I reach quotient subspace I don't know what is happening. I'm stuck in that topic. Any recommendation for a nice explanation in a book or online material to get intuition and make more mathematical problems?
Note: I'm currently studying from Linear algebra by Friedberg and linear algebra by Hoffman.
You could read about It on classical Books as Topica in Algebra of N. Herstein or Algebra of M. Artin for example.