-What is the difference between committing a sin knowingly and committing it unknowingly?

Ignorance is an excuse that removes accountability, based on verses like: {And there is no blame upon you for that in which you have erred} (Quran 33:5), and hadiths like the hadith of the one who prayed poorly. However, this excuse is limited to those who are ignorant of an obscure matter, or who are new to Islam, or who grew up in an environment where knowledge is unavailable. As for someone who lived among Muslims in a place where knowledge is widespread, and committed a sin whose prohibition is common knowledge, their claim of ignorance is not accepted; rather, they are sinful due to their negligence in learning. Ignorance is an excuse in matters of religious obligation (Ahkam al-Taklif), but it does not affect declarative rulings (Ahkam al-Wad‘). Thus, whoever destroys another's property ignorantly is still liable for compensation.