Little Things that Really Matter

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Hello, I'm Sunny Vuong. I live in Houston, TX. I wish to be a Real Estate Investor, specifically a wholesaler. I have watched videos with people saying "You can buy and flip a house, and get money by the end of the week! It's that easy!". However, I know it is not easy because there are little things in between buying and selling a house that matter a lot. For example, where can I get these "contracts" and how do I fill it out, or understanding about taxes and closing costs.

My question is: What are the little things that really matter that I should understand?

Thanks.