What are these folders and files in my library folder? I have several suspicious folders and files in my library folder.
And I was wondering if I should delete them.


ApplicationaContents
ApplicationContents
ApplicationSupport





appn


this is just a file containing the word:

hydrometrid


arracacha




edit:
If you can’t be sure they are safe, make a backup and check you have a copy of the files and then delete them. 

Library can be finicky when you delete something the system needs, but Application Support with a space is legitimate. The others you show in th image don’t come from Apple so they’re malware at worst or third party created at best.