Loophole-Adjacent Approach to RC?

In anticipation of gaining access to Loophole Online, I was wondering if there are any available books or resources that help you to learn RC like how The Loophole teaches LR.

I can say for myself that I thought The Loophole was most useful as a book that provided the implicit "rules" of LR that most people would have to learn only through pattern recognition. Even the parts that merely told you what approach you should take still deepened my understanding of the fundamentals of LR by shedding some light on LR's overall structure. Regardless, I'm just wondering if anyone has any recommendations for a resource that provides a similar approach to RC.