Sometimes you could need to delete duplicate files and especially if there are many folders this could be an hard job.
There are some free good software that allows to easily find duplicate files and remove them:
Duplicate Cleaner Free
it allows to find duplicate files in a fast way and has an easy interface.
You just need select mode (Normal, Image, Audio) and set the various parameters and search filters, then select the folders to analyize. Once the scan is done you can select the files to delete.
Auslogics Duplicate File Finder find duplicate files not only by name but also by content
SearchMyFiles Nirsoft utility, has the advantage to dont require installation and it’s small, has advanced file search features