Yep, I understood the Chains @Tom Welsh , but I hear, the methods have been changed, how those methods work I am unable to understand bro. If it possible, can you please explain me, how those methods will work with chart or graph, I will understand as quick as possible.

Hey @Tom Welsh I understood the Chains concept. but at 02:14 to 02:22 in the code methods have been changed and I am not sure how those methods will work, I am unable to understand bro from 02:14 to 02:22. If it possible, can you please explain me, how those methods will work with chart or graph (diagram), I will understand as quick as possible.