Hey Guys! (In need of guidance)

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Hello everyone! I'm new to this forum and it looks really intimidating. I understand the basic sections and all but I'm just trying to learn how to better use the forum and the best ways to interact with other forum members. Looking forward to being a more active member! (Also can someone guide me on how to choose the right sellers when I want to purchase something? How do I know when something is legit and when it's not?)