Hello Codeforces!!
In this blog, I have given some links. If you are a beginner and want to learn and practice graph, those link will help you a lot.
Graph Topics and Problems list for Beginners: https://codeforces.me/blog/entry/92820
Graph Theory Playlist: https://codeforces.me/blog/entry/91329
Graph problems: https://codeforces.me/group/ibNhxWfOek/contests