Your Finger is the Mouse when it is on the Trackpad.
The Cursor on the screen goes where your Finger moves it.
Additionally from the bottom of the Trackpad for 10mm moving up towards the keyboard and split in the middle of the Trackpad are the Left and Right buttons.
You do get used to it.
Consider yourselves lucky in the olden days we had on our Laptops two buttons for the equivalent of the left and right mouse buttons but the real killer was the little 1/4” button in between the keys that acted as a mouse and somehow we had to control the damn Laptop with said button.