For me almost every Git teaching resource has gone like this:

Step 1.It is explained that Git is a simple program, and that the underlined idea can be understood easily, it is only that other materials have done a bad job about it.

Step 2. Tell the reader a blob is just the byte object containing the information you are source-controlling. "See how easy it is?"

Step 3. Invent their own nomenclature/diagrams/metaphors for all the other concepts, totally muddling the waters.

Step 4. Become one of the resources criticized on Step 1.