Collections do not contain actual separate files, separate images. Collection do not have any files in them. Collections have data records pointing to the images.
When you select a image shown in a collection, and edit it, you are editing the original image.
If you want different edits for a particular image, say one in color, one in black and white, one with a different crop, etc, then create virtual copy's and edit them
Work with photo collections: Adobe
LIGHTROOM COLLECTIONS (EVERYTHING YOU NEED TO KNOW): LightroomPresets.com
Tips and Shortcuts for Working with Collections in Lightroom Classic: Julieanne Kost's Blog
To be supportive, perhaps a Junior College, a Camera Store, a Photography club, etc, other LrC classes? Also, lots of tutorials on the web.