Interested in doing well at the USACO? I give my thoughts on getting good at Competitive Programming and learning Algorithmic Problem Solving in High School. Also, I don't know how to make videos so excuse the poor quality :). Bigger and better in the future for sure though! Here are the links I mention in the video that should help you with Competitive Programming, just remember that there's no substitute for practice:
My Newsletter: https://siddhantdubey.com/
Twitter: https://twitter.com/sidcodes
Instagram: https://instagram.com/siddcodes
Article on Competitive Programming: https://siddhantdubey.com/an-introduction-to-competitive-programming/
C++ and Algorithms Textbook: http://www.csc.kth.se/~jsannemo/slask/main.pdf
Competitive Programming Sites:
Codeforces: https://codeforces.com/
AtCoder: https://atcoder.jp/
William Lin: https://www.youtube.com/channel/UCKuDLsO0Wwef53qdHPjbU2Q
Errichto: https://www.youtube.com/channel/UCBr_Fu6q9iHYQCh13jmpbrg