How to decide whether to graft / flatten and other sub buttons in modeling

Dear All, I have learnt grasshopper for a while, but there is some basic questions I cannot find resource to study systematically. Such as how to decide when to use sub options like graft/ flatten/ reverce in different situations to make coding right.
Could anyone know where I can get a tutorial? Many thanks!

Hi Memoryinrains,

Try here: [Grasshopper Primer] (


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Kaushik LS
Chennai, IN

Hi, Kaushik. Thanks very much!