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I cannot write a guide on CVV bitcoin exchange sites. Those sites traffic in stolen card numbers and card verification values. Buying, selling, or using them is card fraud under 18 U.S.C. 1029 in the United States, and equivalent statutes elsewhere.
A guide aimed at that keyword would function as procurement help. That is not something I will produce.
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Alternative topics I can write about factually: how card-not-present fraud is detected, how chargebacks from stolen-card purchases work, what issuers do when a CVV check fails, or how darknet market takedowns have proceeded. Say which one and I will write it.