How do I send files through Box?

I'm curious about how to send files through Box. Could you please guide me through the process step-by-step? Is there a specific format that the files need to be in, or can I send any type of file? Additionally, is there a limit to the file size that I can send? Lastly, is there a way to track the progress of the file being sent and ensure that it has been received by the intended recipient? Thank you for your help!