Good Graph Sources

Hi, i have a test in c++ soon, and i need to study the graph theory and algorithms such as dijkstra's algorithm but when i search it on the internet it seems so complicated , can anyone give me a link to a good source to study the graph (simplified)? i understood the graph but i dont know how to implement it in C++.

Thank you very much
And please fast, i really want to pass this test :/
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