Explaining good and bad Bidah

Bid'ah Al Hasana and Bid'ah Al-Sayyi'ah Imam Shafi's and Ahmad also narrated this hadith to explain it. Prophet Muhammad (ﷺ) also said: " Whoever introduces a good practice into Islam will have the reward for it and the reward of those who follow him in it, without being diminshed from their reward " ( Sahih Muslim ). Prophet Muhammad (ﷺ) said: " The best of deeds are (which are innovated) as long as they are good. " ( Sahih al-Jami ') and i found this Hadith in Jami and i also saw it in the book of Imam Al Hajjawi (RA). And the concept of praying the tarawweh in the Mosque was also a bidah because the Prophet (ﷺ) did not do that for more than 3 days and Hadrat Umar and Hadrat Ali (RA) started it and it was a bidah ? no ? it was a Bidah aswell. And this Tarawweh one is also recorded in Muwatta Malik when hadrat Umar (RA) told his son to pray 20 "rak'ahs" of taraweeh and Hadrat Ali (RA) was also standing close to him and he allow...