I like to tell people that if you plan to be an investor who is flipping and holding all the time, on your flips just set aside 40% of the profit to be safe. 

Not much you can do if their accounts are set to private.

Here are a few I recommend: "Rich Dad, Poor Dad" by Roberto Kiyosaki; "Set for Life" by Scott Trench; "The Unofficial Guide to Real Estate Investing" by Spencer; "The BiggerPockets Ultimate Beginners Guide" found here on BP; "The Book on Rental Property Investing" by Brandon Tuner.

And without cash flow lending options also become limited. 

Which you can set to not answer and go right to voicemail.

I would go on to facebook and find STR groups for your location(s) in question and see if there is a way to get a license already held by someone else, or if they are just completely off limits.

It's a great way to start out and set yourself up for your next deal and far less risky compared to doing a flip for your first deal. 

(although due to covid this is limited).Anyone has any experience/knowledge in investing in this area ? 

@John Underwood The case that set precedence for this tax lien change was not in Colorado - my concern is that other states will also follow suit, and they may, like Colorado, do so without reasonable notice or consideration to premiums paid or impact on investors who invested before the change. 

I emailed the main address and asked about a license number and they responded this, "Unlike other individual HML we're not limited to an NMLS because we offer a nationwide lending option."