Great Sects usually have a Golden Scripture Pavilion, which contains various books and Jade Slips, including all sorts of knowledge from the Cultivation Realm. Sect disciples can borrow or exchange for these resources to obtain Cultivation Techniques and enhance their insight.
Nutwood Mountain had nothing of the sort.
After Master Daxton Campbell gave the eldest senior brother the Life and Death Art, he stopped caring altogether, leaving him to comprehend it on his own for a hundred years. One day, he broke through four realms and became the first person of all time to do so.
The second senior brother, it is said, had gathered quite a few Cultivation Techniques, but he was mostly self-taught too. Later on, he traveled the world, comprehending the Cultivation Techniques of all under heaven, and eventually created the Astounding Cicada Art on his own.