As I’m of the opinion that each deck “family” has it’s own symbolic language (briefly, French, various Italian, German, Waite-Coleman Smith, Crowley-Harris, and all of their derivatives, etc.), I feel it’s important if you are going to use one of those decks, that you have at least a basic understanding of the deck’s symbolic language. Decks in the same “family” may not have the exact same symbolism, but they will generally be close enough to understand, even if it’s heavily “accented”.