Acknowledging the Arcane Knowledge of Euler

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Hello anons,
I'd like to ask a genuine question. As a mechanical engineering senior I've been taught the works of Euler in many courses such as calculus, electromagnetism, machine design and cae. I'm not very smart, so even though I tried I mostly couldn't comprehend how he deduced his findings and the confusion annoyed me. Did he gain arcane knowledge through scientific work?
If anons that are versed in his work explained I'd be grateful.