how to use R in kaggle

Hi folks, I have over 10 years of experience with R and need a non-intuitive intro to using R inside kaggle if there is one. I see tutorials on using R, and looked at some Titanic tutorial, but it seems written for intuitive people. makes no sense to me as there is a lot of non-commented and strangely commented code and no explanation how to run segments or just a line of code. Thanks everybody Steephen

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