See also: The Basics
Yes and no respectively. Some expensive stranges can be banked through item banking (check the list that you can see in item banking to see which ones) while all the other stranges can be banked through strange banking. We do not have any special banking for vintage items at this moment, but you can sell vintage hats in hat banking.
You can trade with our bots or with anyone as long as the items that you are trying to trade are tradeable. You can check this at your steam inventory.
When you are free to play you will only find/craft non tradeable items. In order to find or craft tradable items in TF2 you need to become premium. You can become premium by buying an item from the Mann Co. Store or by having someone give you an "upgrade to premium" gift. If you are F2P, the only way to obtain tradable items is through trading with users and bots.
Please note that your trade restricted (F2P) items could show up in any of the "Sell Items" sections, because our site may be unable to detect if they are tradeable or not. If you select these trade-restricted items, the bots will not be able to send you a trade offer!
Your suggestions are always welcome, we always look forward to improve any of our services. If you would like to share your suggestion, you can make a post in our suggestions forum. Make sure to read the guidelines, and look at the other threads to make sure your idea hasn't been posted already.
Go to /announcement/ to see a list of all active announcements.