not related to discrete math
not related to discrete math
not related to discrete math
not related... You got the idea. Do not give useless and unrelated advise.
@OP, I doubt that there will be many videos and other alternative information mediums for more in-depth math. The further you go, the further you will be constrained to textbook, references, scientific papers + any book you can find in your library and the less info you can find in the net (aside from digital textbooks and published papers).
Depending on what you learn in discrete maths, you might need different subjects, so learn, what are you will be studying first.
You will most likely learn Combinatorics and Graph Theory. You should be able to find resources for these easily (unlike more technical Number Theory for example).
Discrete math is kindergarten in comparison to what is going to be later.