If you ever heard of something called *cough* PROFIT TRADING *cough-cough*, it's a magical thing where you slightly inflate an item's worth and sell it for that much more than what it's originally worth, to make a bit of extra profit. But it usually only works for Stranges, Unusuals (GOOD unusuals, not low-tier shitty ones), Australiums (Killstreaks w/ strange parts usually), etc., so don't think it'll work if you try trading from a scrap to an unusual like most tutorials tell you to, people will easily catch on and foil your plan before it gets underway. If you ask if anyone wants to buy a weapon for a scrap each, you're just blantantly stating your a sucker for the whole scrap to unusual method EVERYONE's done before.
Basically, get with the programs and actually learn about the in-depth parts and strategies around real-world trading and consumer buy-and-demand deals/ market.