What are fittings, and why are they important?

What did many early american settlers showa. scenes from story booksb. alphabets and numbersc. portraits and decorative scrollsd. pictures without special meanings

After first arriving in new york, charlie parker took a job as a dishwasher at jimmy's chicken shack, where played the piano nightly. listening to his astonishing harmonic restructuring, virtuoso phrasing, and breakneck tempos every night for three months, charlie parker challenged himself to adopt these qualities into his playing, and he continued to practice tirelessly.

What does it mean to have a bias (for example your bias of bts)?