Is there a limit for the number of folders a library can have? If so, what is the limit?
As far as documentation is concerned, there isn't. However, there are limitations to the number of libraries as well as the number of files:
- Content: maximum number of libraries - 2,000
- Content: maximum number of content documents - 30,000,000
Further information on limits can be found in the help article about Salesforce Files and Salesforce CRM Content Limits.
Salesforce documentation has not mentioned this limit. There is a limit for the number of folders in a library, Maximum 500 folders could go in a library.
Attached the images showing error messages while trying to create a folder in a library that has 500 folders, Dev log while trying to add a folder from a VF page.