How do I move Office 2011 for Mac to my new Macbook Air

Office 2011 will not run on a new Mac that is running macOS Big Sur (or Catalina).

Microsoft does not provide free upgrades between major versions of their Office products (unless you subscribe to Microsoft 365) and older versions of Office are not compatible with macOS Catalina or Big Sur.

You can either subscribe to Microsoft 365 or you can make a one-time purchase. See: https://products.office.com/en-us/buy/compare-microsoft-office-products-for-mac?ms.officeurl=mac-compare-redir

Or use the free Microsoft Office on the web: https://products.office.com/en-us/free-office-online-for-the-web

or Google Docs: https://www.google.com/docs/about/

or the free and very good Libre Office https://www.libreoffice.org/

or Apple’s Pages and Numbers