about free tutorials

i cant afford to buy thos dvds can u pleas sujust me about , i wana beaome a research and refferenc guy, wah kind of studys do i need to do  like that, iam attednding a govt collage now  but i wana be somthing like the one who does research about prodects can u sujjust waht kind of carrer do i need to choos

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