To use an analogy, if a person were a computer, then a Cultivation Method would be like upgrading the hardware. The various Secret Techniques would be the software that runs on that hardware. The two are complementary, allowing the user—the Cultivator—to achieve their various goals.
It wasn't that Yara was unwilling to teach Su Zhou the second volume of *Sacred Geometry*. According to its own words, "The *Sacred Geometry Original* is a supreme scripture that carries immense informational turbulence. It's one thing to have it on the Main World, Earth, at the center of the Great Seal where it's suppressed. But if you carelessly take it out in an Otherworld, you might attract a lot of troublesome attention."
"You certainly don't want to go to some random world in the future only to be targeted by a dozen beings like me, do you? It's better to keep a low profile when you're out there."
