GRAPHS

Here are some beneficial tutorials on graphs written by Codeforces users

• 0-1 BFS Tutorial by himanshujaju
• 2-SAT by HosseinYousefi
• Algorithm Gym :: Graph Algorithms by PrinceOfPersia
• On Euler Tour Trees by ifsmirnov
• Vertex Cover and 2-SAT by irkstepanov
• Add Edges to Digraph to make it Strongly connected by chaotic_iak
• [Tutorial] The DFS tree and its applications: how I found out I really didn't understand bridges by -is-this-fft-
• The “Bridge Tree” of a graph
• Articulation points and bridges (Tarjan's Algorithm) by searleser97
• [Tutorial] Maximum Independent Set in Bipartite Graphs by C137
• Centroid Decomposition on a tree(Beginner) by YoyOyoYOy000y000
• [Insight] Number of Topological Orderings of a Directed Tree by Osama_Alkhodairy
• Online Query Based Rerooting Technique by DeadlyCritic

If you know some good tutorial on Codeforces which is not in this list and another list provided below please mention it in the comments I will add that in the list.