Hello are the files in recents duplicates that I can delete?

The files that you have control over are located in the Documents, Downloads, Pictures, Music, Movies and Applications (3rd party apps only) folders.  You can use this free app, GrandPerspective, to find the largest files on your drive so you can determine if they can be deleted or moved to an external HD for storage.

Note: you can empty the Downloads folder after the apps and/or updates that were downloaded have been installed or applied.  Some users have found a couple of Gigabytes of files in their Downloads folder which are no longer needed. 

The files in "Recents" are not duplicates if that's what you mean. They are pointers to the original files.

If it bugs you, you "hide" Recents: Finder > Settings > Sidebar. deselect Recents.