As Salaamu Alaikum Wa rahmatullaahi wa barakaatuhu.1.If a person don't learn or delay to learn about Islamic Knowledge which is fard like knowledge of Creed,Salah,Zakat, Fasting not because of disbelief or denail.Is this kufr or shirk2.In mosque if I see some Islamic books kept on the top of Quran . Is it necessary to put it properly or replace it from above the Quran.If we don't do it is it kufr or shirk sinful

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

It appears from your question and your previous questions that you are affected with whispers, so we advise you to avoid them, ignore them, and seek to treat them by consulting psychological specialists.

The mere delay of a Muslim in learning what he must learn is neither disbelief nor Shirk (polytheism).

Placing a book on top of the Mus'haf or leaving it like that is neither disbelief nor polytheism, but it is more appropriate that no book should be placed on top of the Mushaf, and one who sees this should change that and place the Mus'haf on top of the book.

Tuhfatul-Muhtaaj authored by al-Haytami reads:

“Al-Bayhaqi said like al-Hulaymi: “It is more appropriate that one should not put another book on top of the Mus-haf, a book or a garment, unless it is another Mus-haf like it. Al-Hulaymi said the same thing applies also to the book Jawaami’ as-Sunnan.” [End of quote]

For more benefit on placing (putting) something on top of the Quran (Mushaf), please refer to Fatawa 409174 and 115602.

Allah Knows best.