How did Al-Albani authenticate hadiths, and do they then become acceptable to act upon? And did he authenticate hadiths from Sahih Al-Bukhari?

Allamah Al-Albani is one of the contemporary scholars widely recognized for his knowledge, meticulousness, and precision. He contributed to purifying the Sunnah from weak and fabricated hadiths. However, he is not infallible. The authentication or weakening of a hadith relies on earlier scholars and the preference given to some of their opinions over others. If Al-Albani ruled a hadith authentic, it means he found it fulfilling the conditions of authenticity, and therefore it should be acted upon. He authenticated a few hadiths in Sahih Al-Bukhari that some scholars had criticized, and he found sound chains of narration for them.