THERE IS PLENTY OF PHISHING SITES THAT TRY TO STEAL YOUR INFO, SCAMMERS MAKE HUNDREDS OF FAKE STORIES TO MAKE YOU CLICK THE LINK AND BECAUSE OF THAT I CANNOT LIST THEM ALL. DON'T VISIT ANY WEBSITES YOU DON'T KNOW OR TRUST!

Example:
The scammer will send you link that looks like normal profile or tradelink but it's diffrent and leads to a site that will give you malware and because of it stole your data. It sometimes comes with random bot with Steam nickname like [Site] Bot #[Number] saying you won a giveaway (you never participated)
Many of them also use method they are trying to trade with you and they send you link to "screenshot" of their item which leads to a phishing site.
Malware are usually but not limitimed to file extensions like:
.scr, .exe, .txt, .dll


Other variant:
The scammer sends you message like "Hello, I wanted trade my ak redline for all your cases or graffities. So if u dont need them just send me offer. My ak and tradelink in my main - (LINK) Dont add me i got limit, just send offer. Thanks"
but on their profile there is fake "trade link" that will lead to a phishing site

They are trading sites that have deposit button.
Most of them also lure with something like "50$ free promo code" or name similiar to other websites that are trusted by many people. The point of this is to "deposit" aka gift your skins.