Q: Does deleting photos from my icloud folders in the icloud folders  on windows pc also erase them from my online photo library?

Hello tirayellow223,

You asked if deleting photos from iCloud folders on the PC also erases them from the cloud.

See  Get help with iCloud Photo Library for your Windows PC - Apple Support

When you delete photos and videos from your Apple device or on iCloud.com, they won't be deleted from your PC. And when you delete a photo or video on your PC, they won't be deleted in iCloud Photo Library.

Please check out that article for more details on iCloud Photo Library.