I didn't want to buy any PC storage because they were too expensive. I recently bough a flash drive though. Am I allowed to download things and put it on the flash drive?
E.G: Open WinRar files in my flashdrive.
Is it possible?
Flash drives are usually quite a bit more expensive per Gigabyte than normal Hard Drives and SSDs. They are also quite a bit slower and less reliable. If you are trying to save money, they are not the way to go.
You can, however, use them just like a (small, slow) hard drive.
You can store anything you want on your flash drive. That is what people use them for. Some flash drives are bigger/smaller and faster/slower than others.
Windows will use the flash drive like any other drive. You can copy/paste/edit/delete files in the same way. If you have a card reader even SD cards can be had for cheap(not hard drive cheap when you take into consideration the space, but still cheap).
If you need storage on the cheap, hard drives are fairly cheap compared to solid state drives and for file storage the speed is roe than enough.