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Really inspiring thankyou.

Although I've not used it, I've heard good things about Khan Academy... Which is aimed at kids/teenagers but would cover any core principles you might be missing:

https://www.khanacademy.org/computing

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Yeah, I studied with Khan Academy too, and my kids are learning with Khan as well. But unfortunately, it doesn't go deep into core principles. There are better resources for Algebra, Geometry and Precalculus, like Professor Leonard, OpenStax, and The College Preparatory School, which is listed in the OSSU prerequisites for Computer Science.

Coursera and Udacity have been around for a long time. Not to mention countless youtube lecture courses on any imaginable subject.

There is same courses on youtube, + books etc. All is free and perfectly organized.

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