This video discusses the basics of ferrite beads, and their uses for basic filtering applications. It discusses and demonstrates how ferrites act as resistors at high frequencies, and how this is used for EMI/RFI Suppression, improved power supply filtering, parasitic oscillation suppression, and others.
This is another fantastic tutorial by W2AEW with great, easy to understand practical examples. It’s another area that is not very well understood by most engineers. This video should thoroughly de-mystify ferrites.