السَّلاَمُ عَلَيْكُمْ وَرَحْمَةُ اللهِ وَبَرَكَاتُهُ Usthadna, please take your time and suggest to us the authentic sources where we can learn/read about Umar ibn Abdul Aziz رحمه الله, Hassan albasari رحمه الله, Abdullah ibn Umar رضي الله عنهما, Hudaifa ibn Yaman رضي الله عنه BarakAllah feekum

Ustadh AbdulAziz al-Haqqan

Their reports are in the books of siyar and tarajim of the salaf, but the way of our ulama is to take the most important first, tawhid, aqeedah, and how to worship Allah correctly, and then to expand into other areas.