Learn Polish: Czy szef jest tolerancyjny wobec nowych pracowników, czy bardzo krytyczny? - Is the boss tolerant towards new employees, or very critical?

Wobec means "towards" or "in relation to," and it always requires the Genitive case. That is why the phrase following it takes the Genitive plural form: nowych pracowników (new employees).

Could I use dla instead of wobec to say "tolerant towards"?

Not naturally. While dla is used for simple benefit or harm (e.g., dobry dla - good for/to), wobec is the go-to preposition for expressing a specific attitude or behavioral stance towards someone. Adjectives describing how you treat people, like tolerancyjny (tolerant), wymagający (demanding), or lojalny (loyal), pair with wobec.

Why does the word czy appear twice in this sentence?

They are doing two completely different jobs! The first Czy acts as a question particle to turn the statement into a question (translating as "Is..."). The second czy acts as the conjunction "or" to offer an alternative. This "Czy X, czy Y?" pattern is the standard way to ask "Is it X, or Y?" in Polish.

Why are the adjectives tolerancyjny and krytyczny in the Nominative case? Doesn't the verb być (to be) trigger the Instrumental?