en_tn_lite_do_not_use/tit/01/09.md

hold tightly to

Paul speaks of devotion to the Christian faith as if it were grasping the faith with one's hands. Alternate translation: "be devoted to" or "know well" (See: rc://en/ta/man/translate/figs-metaphor)

good teaching

He must teach what is true about God and other spiritual matters.