Rainbow Style Loading Cursor On MacBook Air 2017
Yes, sometimes you will see that. The rainbow pinwheel means that an app is busy. Usually it will go away after a few seconds. If it doesn’t, there may be an issue, such as an app, or in some cases, the OS being locked up.



Also, since you are new to macOS, you might find this iBook helpful. It is a guide to MacBook written by Apple.
https://books.apple.com/us/book/macbook-air-essentials/id963295730