From there, you can move on to the BRRRR method with single-family homes—buying undervalued properties, rehabbing them, renting them out, and refinancing to pull out your investment for the next deal.

You are (older/retired) and could benefit from house hacking and buying a duplex, or renting a room.

Yes, they will do many things better than you, but some things it's not possible for them to be as attentive and quick responding as you.Also, no one's perfect, so keep tabs on them in general.Regarding holding or selling: why did you buy this in the first place?

Quote from @Garrett Cuppels: spent $15 on a book about Airbnb rentalWhat book did you buy?

anyone can buy a bad deal - just go on Zillow and pick the first property you see and buy it. 

I already have a hand shake deal on the next property, another duplex, that I will buy come summer time.  

@Polat Caglayan very ambiguosu question, but read the helpful info below to guide your next set of questions:)-------------------------------------------------------------------------------------------Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

It'd just be a shame for you to sell a building and pay tax only to then reinvest your net proceeds after tax in buying your first pieces of investment real estate.  

I'm looking to purchase a single family home as an investment property (buy and hold strategy).

HELOC is usually a good option for something short term, you, don't really want to buy a long term rental property on a HELOC.