- What documents do they require applicants to submit & why?

I agree with @John Underwood & @Mike Grudzien, and I would expand on documenting *EVERYTHING*. 

There is a legal concept that when a contract is ambiguous that it will be interpreted in favor of the party that did NOT write the document.

I have done a formal inspection with the lease but I give the tenant a checklist to fill out with the least when they move in so they can document anything that is broken or needs repair.

You just have to use custom documents. 

If you want to email me, I can send you a document with the bullet points.

google All inclusive Deed of Trust state of CA.. that will give you a really good description and if you can find the actual deed of trust to read its a great wrap document .. in practice   you have a current 100K loan at 8%  you sell by owner and take a 125k note at 9%  the 125k wraps the 100k.. you continue to pay on the 100k the while the new owner is paying on the 125k  payment lets say on the 100k are 1k a month the new payment is 1.2k a month you make the 200.00 delta..

Getting less every month is still generally more cost effective than dealing with a tenant that stops paying or causes damages to the property.However, if you do decide to change your selection criteria and you are worried about fair housing, the main thing is documentation.

The HAP and related documents is from the state and very specific.

The home buying process typically follows these key steps:Assess Your Finances: Review your credit score, savings, and determine how much you can afford for a down payment and monthly mortgage payments.Get Pre-Approved for a Loan: Work with a lender to get pre-approved, which gives you a clear budget and shows sellers you’re a serious buyer.Find a Real Estate Agent: Partner with an experienced agent who knows the local market and can guide you through the process.Search for Homes: Browse listings and visit properties that fit your criteria (location, size, price, etc.).Make an Offer: When you find a home you like, submit an offer through your agent, including contingencies (financing, inspections, etc.).Home Inspection & Appraisal: Once the offer is accepted, hire an inspector to ensure the home’s condition and the lender will order an appraisal to verify the property’s value.Secure Financing: Finalize your mortgage by submitting required documents and ensuring the lender clears you for closing.Closing: Sign the final paperwork, pay closing costs, and receive the keys to your new home!