A method for preliminarily learning difficulty concepts/data structures/algorithms and being able to put them to use very quickly... within minutes!

In short: blindly copy-pasting code is okay, most of the time.

Stuff I said would be in the description: 
AtCoder Library: https://codeforces.com/blog/entry/82400
cp-algorithms: https://cp-algorithms.com/
kactl: https://github.com/kth-competitive-programming/kactl
Benq's library: https://github.com/bqi343/USACO
My library: https://github.com/galencolin/cp-templates
A cool online judge to test library code: https://judge.yosupo.jp/

Some timestamps:
Intro/overview 00:00
Black box description/examples 01:00
How to use it 04:17
Advantages 07:06
My personal examples 09:00
Practicality/useful libraries 11:27
Final remarks 13:07

Szymon Omieciński

HTMX

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The Black Box Method is an effective way to learn complex programming concepts quickly. This approach involves understanding what a piece of code does (its inputs and outputs) without delving into how it works internally. This method is particularly useful in competitive programming and general programming as it allows for rapid problem-solving using pre-existing code snippets or libraries. The method can significantly accelerate the learning process and aid in tackling difficult problems effectively with minimal initial understanding.

The Black Box Method: How to Learn Hard Concepts Quickly