What counts as bid'ah (innovation)?

“The Hadith has severely condemned all bid'ah practices. Rasulullah (Sallallahu Alayhi Wasallam) said, "Every bid'ah practice (innovation) is misguidance, and every misguidance leads one to the fire of jahannum." Hence, it is not permissible for one to participate in such a gathering.”

“What is a reprehensible innovation? Firstly, what is a reprehensible and sinful innovation? It has two essential parts: a) It was not done by the Prophet and the early generations; and, importantly,”

“You inquire about the following issues: Is congregational ‘Ibadah in the last ten days of Ramadan to find Laylatul Qadr bid’ah? Are women allowed to pray Taraweeh Salah in a Masjid or with a jamaat?”

“Bidʿah refers to introducing new practices into dīn and considering it, or permissible acts to be a necessity that must be done. Bidʿah carries a negative connotation because it implies tampering with the divine system of Allāh ﷻ. Allāh ﷻ emphasizes the perfection and completeness of Islām in the Qur’ān:”