Functions
Quadratic equations and functions
Differentiation & Derivatives
Definite integrals, antiderivatives/primitive function : examples and definitions of the Oxford Concise Dictionary of Mathematics
MIT lesson : Define integrals, area under the curve,...
you can see this lesson using this website : https://archive.org/details/MIT18.01JF07
Sequences
Pascal's triangle
The 12 days of Pascal’s triangular Christmas : MICHAEL ROSE, UNIVERSITY OF NEWCASTLE 23 DEC 2013
see website : https://www.sciencealert.com/the-12-days-of-pascals-triangular-christmas
Properties of Pascal's triangle, LIVESCIENCE (binomial theorem, binomial distribution (Galton board), Fibonacci sequence, fractals,...
see website : https://www.livescience.com/51238-properties-of-pascals-triangle.html
Probabilities