You can set up notifications for folders where you need to be notified of document changes. Click on a folder and then Notifications. There are two tabs and anything set up in here is user specific.
You can select Daily Digest, None or Include Subfolders. If Daily Digest is selected, you will get a daily email highlighting any changes to documents within that folder. If you have selected a high-level folder which contains Subfolders, you can select Include Subfolders and the report will include all those other folders.
If you need to remove notifications from some folders, you can delete the folder within this tab: