I complete agree with @erfajo and @Kulkul little effort will take a long way, first check the dynamo version and check you have all packages that you need to run the graph. For beginners, take a graph and follow it with small inputs and study what each node is doing. I printed the graphs and followed it manually. Once you get your head around it, you can tweak it to suit your needs. my graphs run on 1.3.2 to 2.0.0.