These videos although old and dated 1970 from the American Airforce are still very accurate and clearly show the different types of filter from RC, RL, LC, RLC, T filter, Pi filter etc. Please study both. I have made some notes from snippets of these videos. The old videos have many great ideas for training.
The notes for this lesson are coming soon. Basically some copies of board notes from class and some snippets from the videos with typical circuits and examples of applications.
Jeff Quitney Electronics Training Videos Vimeo