Jaren Barnes - I have attended a number of sales but bought only a few parcel at county Tax Deed sales (sometimes referred to as Sheriff's Sales). Most of the time the properties are fairly useless. If got the route of buying from a tax sale - you want to be sure you due your due diligence ahead of time. You want to know what you are buying. I went to a tax sale once and watched a guy buy a lake (more like a small pond) in a developed neighborhood. The owner's association evidently had not paid the taxes on a 5+/- acre parcel that had the neighborhood lake / duck pond on it and the county (near me) sold it at the tax auction. I had some small chat with him before the sale started - he was wanting to get into investing in tax deed properties, etc. but hadn't bought any thing yet. He said it was his first tax sale he'd been to. I had researched all the properties going to sale and knew it was a pond (Google Earth). When the guy started bidding, he had a couple other guys in the room bidding as well. I eased over to where he was standing him and tried to give him a heads up - but he waived me,said he was trying to pay attention the sale because he was bidding on a property. So - I left him alone and he won the bid for about $4K. I didn't have the heart to tell him afterwards -just minded my own business. Hopefully he was able to sell it back to the HOA for what he paid + the 25%.
In TX, if someone purchases the home, or land designated for Ag use, at a tax sale - there is a two year redemption period. For other land it is 6 months. During this period the previous owner can get the property back by paying the person who bought it at tax sale amount paid at tax sale + 25% "interest" per year, with a minimum 25% of the amount due. My research - now dated - indicated about 90% of houses sold at a tax sale get redeemed but less than 5% of land.
Nonetheless - the caveat is you will likely need to hold any land bought for at least the redemption period (e.g. 6 months in TX) at least 6 months to ensure it isn't redeemed = before yo sell it. Also - you generally can;t get title insurance on tax sales properties - at least not fro a while. I've seen it said 2 years, other places heard 7 years - unless you spend $2 or $3k with a firm like Tax Title Services to get them to issue a certificate that some title companies will accept and write title insurance.
One alternate strategy is to get the list of properties going to sale as soon as it is published and attempt to "snatch" the properties by buying them before the sale from the owner. Then you don't have to mess with a redemption period or the "no title insurance" thing sine their is no sheriffs deed in the chain of title. I posted something in the Club forum about 5 years go on this.
But - back to the topic of info on Tax Sales. Dustin Hahn has a site, course, articles, blog, etc, here: http://taxsalessecrets.com/index.html
And, here is a link from Dustin Hahn's Tax Sales Secrets blog site about the topic of deed grabbing: http://taxsalessecrets.com/blog/2011/07/05/all-about-deed-grabbing/
Here's a link I found in a ten-year Bigger Pockets thread to a site with link to Rick Dawson's "Land Grabber" course - appears to be discounted now from 1,697.00 to $147.00:
Hope some of this helps.