Excellent to see you here.
Buddhaghosa was a Sri Lankan commentator who collated, compiled and contribute to the Theravada commentarial tradition, approximately 1000 years after the Buddha.
As for introductions to Theravada Buddhism, check out the pinned Introductory Resources thread in the Discovering Theravada forum.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)