This is the Texas Deceptive Trade Practices Act, the main consumer protection law in Texas. It contains a list of prohibited actions that businesses and other sellers may not take.
The State Bar of Texas created this guide to legal questions from those affected by disasters. Chapter 8 is about how Texans can avoid scams and protect themselves after a natural disaster.
The Texas Attorney General's office "protects Texas consumers by accepting complaints, filing civil cases in the public interest and educating Texans on how to spot and avoid possible scams."
Tips from the Better Business Bureau and the BBB Wise Giving Alliance on how to help after Hurricane Harvey, and how to do so with caution, and make sure your donations get to the people who need them.
This news article states that Texas is "the only Gulf Coast state without a requirement for a roofer or builder license" and provides tips for avoiding scams. Also included is information about scams where the builder offers to negotiate with your insurance company on your behalf or offers to cover your deductible. This news article contains the opinions of the article's author.
This national program run by the federal government allows you to check the history of a used car. The site also provides helpful information for avoiding fraud when buying.