Programming :: Bash Command To Remove All Files Within A Specific Folder?

I want to delete all files within a specific folder without actually deleting the folder, what is a good bash command for this?. I found this one but encountered some errors even though I am executing it within the specific folder:

useratdebian:/home/user/folder# find . -type f -exec rm -rf {} ;
[1] 5052
useratdebian:/home/user/folder# find: missing argument to `-exec'
[1]+ Exit 1 find . -type f -exec rm -rf

The command as it appears is:

find . -type f -exec rm -rf {} ;

how to delete only the files contained within the folder called "folder" for example?