An interactive website https://seeing-theory.brown.edu that takes you through some of the most critical probabilities and statistics concepts.
Statistics 110: Probability
If you want a more advanced overview of Probabilities and Statistics, this course from Harvard University is an excellent introduction:
https://www.youtube.com/playlist?list=PL2SOU6wwxB0uwwH80KTQ6...
This is MIT Course 18.06, taught by Professor Gilbert Strang.
https://ocw.mit.edu/courses/mathematics/18-06-linear-algebra...
One of the best linear algebra courses that you’ll ever find.
Essence of Calculus
This is Grant Sanderson’s excellent take on calculus:
https://www.youtube.com/playlist?list=PLZHQObOWTQDMsr9K-rj53...
I will forever worship the ground that man walks on for his mathematics help.
https://news.ycombinator.com/item?id=37305485
I haven't gone through all of them but I definitely recommend 3blue1brown and betterexplained