This is from the State of Florida's website and here's the answer to the op's question.

There are so many websites and of course, most cost money to join.

I'm not sure if we can like to articles on our own websites here, so to be safe I'll just suggest the IRS web page, which does do a pretty good job of explaining the basics: https://www.irs.gov/taxtopics/tc510The main thing to know if you're going to claim business miles is that you do need to keep a log of every business trip. 

I check the SEC, FINRA, ratings websites for inside information on the principals in the company.

I wouldn't even have known about this law had I not been on the Secretary OF State's website setting up a new LLC.

The judge had doubts about the veracity of the website I was using to collect the rent (I gave him a print out of the payments and non-payments from the website) and thought we should have driven to unlock the door for the tenant when he locked himself out (3 hours) instead of telling him that was his issue and he should call a locksmith.In the end the judge asked him how much he thought he owed us and he did his calculations in the courtroom, not having this prepared. 

@Matthew McCarty At the beginning of my investing career, I was constantly looking at websites like Zillow and Redfin to see what houses are selling for so that I have a good feeling on the market I picked.

I didn't read the website you were referring to earlier, but I know that there are attorneys who specialize only in dog bite cases - because there are laws on the books that give specific penalties that are non-negotiable, related to dog bites.  

There is a web site that lists all the section 8 housing, so people might be also be looking there. 

Search online for “real estate meetups” and check their websites for their upcoming speakers.Networking events.