Best resources/methods for learning maths?

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Hi guys, I want to learn university level math starting with linear algebra. I was good at math naturally but am easily deterred by the presentation.
I hate wasting time on things which are intuitively obvious or superfluous conversational explanations of when things might occur or why I should care. I just want “content content content”, preferably not in video form but honestly videos are so far preferable to all the written waffle in online textbooks. I understand that may be useful for less autistic people but I am really discouraged by having to sift out/distill the info I want from slabs of chatter.
I only have a phone so I’d love free PDFs or websites etc. Very much appreciated if anyone can recommend some good stuff.