hazrat abdul qaadir jeelani

Q: Shaikh Abdul Qadir Jilani R.A kon the? Please tell me in view of hadith and Islamic point of view.

Q: Hazrat shaik Abdul qadar jilani suna hai bhot bade Allah wale the to kya inke sawab kliy nafl roza rakhne se hamara iman buland hoga.aur ek sawal qasida ghosia Ki fazilat kya hai. Khatme qadriya ka procedure kafi bada hai kya yaseen shareef Quran etc padhkr inhe isal e sawab nahi karsakte ham?