Overall I think you're on the right track as you're better off not filing claims unless they're very significant.

And is it better for a wholesaler to buy/sell a home under a tax foreclosure or a mortgage foreclosure?

I should be able to qualify for a DSCR loan or conventional loan, but I see down the road that this could affect my DTI and make it difficult for me to get more mortgages in the future.I understand I could use a conventional investment loan and my parents could co-sign the loan to give me better terms, but does this remove the loan from my DTI?

Ask for a comparison based on the current coverage and also any recommendations for better coverage. 

I would like to sign up for either multifamily or BRRRR and am hoping you can provide some guidance/advice as to which would be the better fit.  

It's better to connect and build rapport and let them ask you for deals.Reach out if you have any questions or need help selling a property. 

This shows the list of some of the better cities 

It's better to just not have a stove in there -- the triggering offense for most city code violations -- and do a coffee bar, etc.

Which among three ( townhouse or condo  or SFH) is better for appreciation and cash flow and property management will cost low among three?

This is a much more realistic and better way to start.