Jiang Tang could only impart these skills to them, as these were all he knew so far, but he wasn't foolish enough to teach his best cultivation techniques as well. He would not do something so short-sighted as to starve himself by teaching his disciples too well.
Jiang Tang had previously thought about the Talisman Refining Method, Artifact Refining Method, and Formation Skill. None of these had yet emerged from the Primordial Treasure Lingtian Space, perhaps because he had relied on this space too much in the past.
But he had no family heritage to fall back on, so what else could he rely on if not this space?
The methods produced by the Primordial Treasure Lingtian Space were truly unique in the world, surmounting even the heritage of others' families.
Jiang Tang lectured on the Dao Arts for an hour and then came to a conclusion: he would give a lecture every three days. He didn't want these ten light bulbs lying in wait every day.
