Linux - How to delete all files recursively for sub-folders with out deleting the folder/sub-folder

To List all the files recursively form the patent folder and sub-folder,

cd /target/directory
find . -type f

To Delete all the files recursively form the patent folder and sub-folder,

cd /target/directory
find . -type f -delete

To Delete all the sub-folders & files recursively form the patent folder,

cd /target/directory
find . -type rf -delete

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