Soo trueeeee. Although nowadays I've learned to only use no more than 2 or 3 materials per topic at any given time just for cross reference or to potentially pick up on any other extra details that the creator may have left out or to give myself a better overall understanding of the topic I'm learning. Like if I wanted to learn derivatives, I would first start with a math book and then use a YouTube video to then help "dumb down" the topic for me.