Interesting negating opportunity arises whenever a question contains more than one possible candidate to negate.
Awak bekerja di Amsterdamkah? (Are you working in Amsterdam)
Tidak, saya tidak bekerja di Amsterdam. Saya belajar di Amsterdam.
Bukan, saya tidak bekerja di Amsterdam. Saya bekerja di Roterdam.
The answer indicates the actual negation and the context of speaking determines the negating.
Scenario one, you friend told you he is in Holland, your question might get one of the two replies.
Scenario two, you friend told you he is in Amsterdam, your question may only get the first reply.
Further clarification might solve any confusion…in actual communication.
Either way, we establish that bukan is for noun and tidak is for verb.
In the class I demo further that tidak may be for adjective.
Simply by stretching out my leg and ask for a negating remark, we get
Kaki awak tidak panjang,
Simply by showing my face, a student told me:
Muka awak tidak cantik…
both panjang and cantik are adjectives and they go with tidak in the negation.