What files can I delete ? Ex: junk files, how do I open them to see what contents are?

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What phone?
What version of android?
What carrier?
What app is recommending the deletes?
What are the exact words of the recommendation?
 
Look in your email app for a folder named Junk. Look at the emails in there. If you don't need them, delete them. (Look for Spam and do the same.) Don't expect to regain much space - emails don't use that much room.