Most traders already know this site called scrap.tf but for those who are new to trading and basically new to tf2. Scrap.tf is site for trading, it has a lot of functions like normal trading, badge building, auctions and the one that you need: Raffles. Raffles are one of the easiest ways to get free stuff. just go to https://scrap.tf/raffles and enter as many raffles as you want. You can go by the big money way: Just enter raffles with unusuals/keys/taunts/spec. ks. weapons or prof. ks. weapons, etc... Simply just the mid or high tier items. Or you can go the "I will take anything" way. Just enter every raffle there is. Yep, thats it.

Through phone app and SCM (Steam community market).

If you have a lot of free time, like a lot of free time, you can get a app called GoCases.
This app gives you chance to open csgo skins. Now just hold up, i know this is TF2 guide but this can get you a lot of free money. First there is code that gives you free 20 coins for start: enter code L1S5wQ2P (by this code you also support me). Next thing you have to do is go to "profile" part and there you will see "free bonus", this bonus refreshes every 24 hours. It can give you from 1-5 coins and thats a lot. There are also items from offer wall but not many people do them since they boring as hell. when you will reach 69 coins (nice), you can open one case that can get you AK-47 Neon Revolution, after you win any skin you can sell the skin for coins or you can withdraw it straight into your steam account and then you need to sell it on SCM. Simple but takes a lot of time.

If you buy any game on steam, you have some card drops that are remaining, those sell for 7 cents or something like that, or you can got CS:GO way.

As you may know, CS:GO went Free to play, and there is of course chance to get drop on any Casual or competetive game you finish. These items are not worth much (cheap skins or sprays), but there is chance to get a case drop. Cases can be in price range 0.03-1+ euro(s) (depends on what case you get). Next thing you need to do is again sell it on SCM.

Thank you for checking out this guide.
If it helped you with getting free stuff, feel free to like this guide or smthing idk this is my first guide.
if you have any new ways you can get free stuff, write them in comments of this guide to help other people.
Enjoy free stuff i guess.