For instance, people can market their properties here on the forum. 

Find a map (I found a free local county book in my area on a free magazine stand that had a map of the area) and drive each neighborhood to get an idea of the neighbors (mostly homeowners or renters, single family or duplex/triplex/quad) vicinity to amenities like grocer/parks/schools/etc. and if area feels like something your target market would be interested in (to buy or rent).Go to your county's or city's website and see if you can find any planning information to figure out where the development is happening.Lastly, find (or start) a local meetup to network and learn the information you didn't know you needed to know.Tax liens can vary by county.

Here is a good article about what happened in Over the Rhine .How Cincinnati Salvaged the Nation’s Most Dangerous Neighborhoodhttps://www.politico.com/magazine/story/2016/06/wh...

@Mitch Messer Thank you so much ..Also looking to clean vacant homes/units for knowledge of understanding the ins/outs of landlording...For instance trading my skill cleaning for landlord understanding education

Using it for setting up some investors for a friends real estate acquisition and management business.The income statement he gave me to calculate investor returns from lacked depreciation and corporate taxes.Nobody for instance investing in telecom companies, says whats my IRR on EBITDA? 

Here in the Burgh, for instance, I own a very large balloon-framed brick-veneer duplex built in the 1920s for an heiress.

depends on where it is.. how much your paying and what you want to do with it. for instance in SC  tax sales take for ever to clear title.. so if I could buy say an old dump there in a historic gentrifying area .. for peanuts and just rent it right away and did not need to get a loan or sell it.. 

For instance, if I'm more into creating the perception that my property will keep appreciating because I bought that 1m property and need it to appreciate - this is where I hear statements like 'oh it will just keep going up, people keep moving here' etc. 

My house, for instance, has 2"x6" T&G boards for its sub floor.

For instance in Washington state they seem to have really chosen dumpy depressed areas which will be a challenge ti take advantage of; while here in neighboring Oregon they have designated some very mixed areas that seem to provide some real juicy opportunities for tax advantages.