Are there any sources or individual pages that could provide

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Are there any sources or individual pages that could provide me reliable information on natural and formal sciences?

I am starting to get interested in maths, physics, chemistry and biology and want to learn to solve problems in these fields

I am willful to learn but never truly paid attention in class, what I learned was because I was forced out of bad school notes, now that it's summer I wanted to catch up some material and most of all make up for the things I missed as I'm growing interest for them but can't find any pages where I could start anew from the very beginning and learn until I gain understanding to their different approaches, I think I speak for all when I say that most of my confusion comes from the fact that mathematics later take up a form where they don't use (understandable) logic anymore

I am also interested in astronomy, earth science, materials science, history of the universe, natural philosophy, theoretical linguistics, logic and theoretical computer science if there are any pages dedicated to these