Question on a checkbook/self directed IRA??

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I just started looking at this subject and already I have seen thousands of ads and discussions about tax liens. It seems there are dozens of experts (con artists) that will show you how to make millions in tax liens for a small fee. I bet at the end of the class they also have a bridge can can sell me. Can anyone offer some advice were I can research the wright info. or what books I can read. Thanks Hugo.