Awwww! I just came upon a post from 2007 artist-me being very confused about quaternions in Blender. It's amazing to reflect on how far I've come in understanding maths and CS, but to also have empathy for those just starting out on their journey: blenderartists.org/t/quarternions
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I eventually went on to learn about this stuff in more depth by implementing a linear algebra library. Quaternions are actually _really_ great way of representing 3d rotations! And now there are even more great resources to get an intuition for them, like: youtube.com/watch?v=d4Egbg
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