Any folders you wish to share. People are sharing their files with you. So don't you think they would hope you'd share with them? Actually, a nmber of people filter out those that share less than a certain number of iles be that 5, 50 500, etc. So if you were only sharing 1 or zero you'd never be able to download from those particular people.
So to share files; create a folder & add files to it you wish to share with other people. These can be music files, video files, etc. Then Add this folder as a Sharing folder in your LW Tools>Options>Sharing. You can also add your LW dwnld folder as suggsted earlier. You could also play any of these music files from your LW library. You can play music you dwnld but you would need to share it for it to be available thru the LW Library window.
Still confused ... ???