Every innovation is misguidance!

^Wa As-Salamu 'Alaykum bro

this is actually very simple and straight forward

linguistic definition of bid’ah: anything new which was not previously found is a bid’ah, i.e., computer, cars, etc.

sharee’ definition of bid’ah: anything which is new in Islam, meaning it previously didn’t have any basis in Islam. This includes anything from aqeedah to ibaadah.

So, if something is bid’ah liguistically and it has nothing to do with Islam, then it is not sharee’ bid’ah and we can apply it or use it, etc. For example, using computers. However, if one says “if you use computer 100 times a day, you will get x reward”, then this particular action becomes sharee’ bid’ah.

1 - because both of these had a basis in Islam, for an evidence and detailed answer please refer to: Are the compilation of the Qur’an and the first adhaan for Jumu’ah forms of bid’ah (innovation)? and ](Can You Pray Tarawih Alone? - Islam Question & Answer)Should Taraweeh prayer be offered individually or in congregation? Is completing the Qur’aan in Ramadaan bid’ah?

2 - an act of kulifa rashideen regarding sharee’ah is not considered a sharee’ bid’ah because the Messenger of Allah (sal-allahu 'alayhi wa salam) told us to follow their sunnah. After all, we understand the sharee’ah how the Salaf understood it.

I don’t know anything about this issue and it seems a strange opinion to me

I hope this helps, insha’Allah

Wallahu A’lam