@Sayli MulayI know few people whose rate increased substantially due to a heloc.I am curious why one would refinance if there is already a heloc available, to reduce interest paid?

Crawls have the potential to be remediated to reduce the cost of flood insurance.

Due to the no cash and 2 year term, I could offer seller a higher price than I otherwise could have, then I was able to reduce my basis via Airbnb'ing the property for 18 months, and then sold for $25,000 more than I bought for due to better than expected market appreciation.

I created a solo LLC last summer with the intention of asset protection and reducing taxes but I have no clue what I’m doing.

It just significantly reduces your expenses.

Have your landlord insurance and umbrella policy and keep your properties in good repair (eliminating/reducing risk of negligence,etc type issues).Here are a bunch of prior discussion threads on LLC and insurance which I think you will find useful. 

Of course the taxes will definetely reduce your gross profit, but the taxes should never make a scenario in which you are incurring a net loss. 

Know what you are willing to "let go" of and I say that because one of my owners ended up selling because she really had a hard time letting go of the fact that guests/strangers were sleeping/having sex in the beds. 

By purchasing one MF and not two SFR's , I'll be reducing closing costs and property management costs. 

With out getting into too much detail the USD has a loose inverse relationship to oil, if oil goes up in price it will most likely reduce the inflation rate in colombia which will then make the peso appreciate against the dollar.