How do tax write offs work if you are in business for yourself?

Is it true that I can write off any expenses that I use for my business? I recently got my real estate license and they told me not worry about fees and advertising because I can write all of it off at the end of the year and get all of it back in taxes. Is this true or are they lying to me? What if I join a club... show more Is it true that I can write off any expenses that I use for my business? I recently got my real estate license and they told me not worry about fees and advertising because I can write all of it off at the end of the year and get all of it back in taxes. Is this true or are they lying to me? What if I join a club that requires a monthly membership fee for the sole purpose of meeting new clients? Does that count as a write off?
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