Launchpad provides a Home Screen-like launcher on macOS, and a way to see, start, search for, delete, and otherwise manage apps on the Macbook.
You can find the Launchpad on your Dock.
From here you can click on an app to open it.
You can move between pages by dragging left of right with your mouse, or using two fingers to swipe back and forth.
You can use the search bar at the top to find an app quickly.
If you want to re-organize your apps, you can click and hold an app until it starts wiggling, then move it where you like.
You can drag one app on top of another app to create a folder, or drag an app into an existing folder.