US Immigration from Hong Kong

The interview is next week, and I'm curious, the appointment letter says if I'm here because of marriage, I need to bring my spouse's birth certificate? Is that necessary, or is a passport good?

Also, I watched many videos, and people brought tax return transcripts. However, the letter doesn't mention this. Do I need to bring that as well?

Finally, anything else I'm missing? So far I have:

Green card

Marriage Certificate

State Issued ID

Passport

Tax Returns Transcript (???)

Spouse Passport (or do I really need birth certificate??)

My fianc had an interview they told her she needed to update her D160 they did not give her any instruction on how to anyone experience this what do you do

As our NOA-2 gets closer, anxiety begins to set in as we question our process to make sure we've done everything correctly. Just looking for a bit of validation, as we're 95% sure we're fine.
My fianc e is a Chinese citizen, currently living and working in Hong Kong. She has a renewable work visa that allows employment and legal residency in HK. Based on this, we submitted Hong Kong as the desired embassy for her K1-Visa and interview process.

From my understanding, there shouldn't be any issues with this as long as we secure the police report from both Hong Kong and China, right?

So me (from Hong Kong, a permanent resident in usa) and my husband (us citizen) have a child (he s 29 months old now)

id like to ask obviously he is a USA citizen, but is he a Hong Kong citizen as well since I am a Hong Kong citizen? And if so, what I need to do or where I should contact to get a Hong Kong passport or ID for our son? Do we need to back to Hong Kong for this?

So I had n400 interview in May and I got denied because they said that I was out of the country a lot.

Then my family helped me filed n336 to request a hearing in June.

I got a confirmation mail and never heard back again. I saw some people say they were asked to do fingerprint but i never received any appointment mail.

Does anyone know how long it takes to progress

Thankyou so much