The Samsung Galaxy S8 stores in a phone log all incoming and outgoing calls. So you can see later which contacts you have contacted or from whom you have been contacted. For example, you may want to delete the last calls on the call log because you do not want to track who you were on the phone with.
Deleting entries on the call log works as follows:
First, open the phone app on the Samsung Galaxy S8. Now select the "Last" tab - you will now see the call log. Tap the three-dot icon in the top right corner and then on "Delete" Now select the entries that should be deleted from the call log.
Then tap "Delete" on the top right to delete these calls from the phone log. You now know how to delete certain entries from the phone log of the Samsung Galaxy S8.