Can you please clarify the terms Sunnah Hasanah and Bidah Hasanah giving examples of each. I cannot understand and differentiate between the two.

“If anyone introduces a good tradition that is followed, he has a reward for that and the reward equivalent to the reward of those who follow it without any diminution in their rewards; and if anyone introduces an evil tradition that is followed, its burden as well as the burden of those who act upon it, will lie upon him without any diminution in their burdens.” [1]

•  This is in reference to what the prophet approved – not innovation / bidah.

“He who revives a Sunnah of mine, then people acted upon it, would earn (a reward) similar to the reward of one who acted according it; nothing would be deducted from his reward.” [2]

It means to invite towards good according to the Sunnah of Prophet (ﷺ),

whereas the concern about Bid'ah Hassana, its has no value in Islam and Qur'an and Sunnah as Prophet (ﷺ) said,

“Every innovation is misguidance and every misguidance will take to hell fire.” [3]

So those who said that Bid'ah-tul Hasana is acceptable and Bid'ah-tus Sayyi'ah is not acceptable they have not adopted the correct methodology.

References:

[1] [Sunan Ibn Maajah, Book 1, Hadith 208]

[2] [Sunan Ibn Maajah, Book 1, Hadith 214]

[3] [Saheeh Muslim, hadeeth number 867.]