need a spreadsheet application for MacBookAir

My personal preferences is Excel (Microsoft Office): https://products.office.com/en-us/buy/compare-microsoft-office-products-for-mac?ms.officeurl=mac-compare-redir

But Apple's Numbers application is free and probably already on your Mac. https://www.apple.com/numbers/

Another options is Libre Office -- more like Excel than Numbers, free, and very good: https://www.libreoffice.org/

Apple's Numbers is free and adequate for basic needs. You can look at Excel by Microsoft. It's an industry standard but not free. LibreOffice is also a popular recommendation.

However, without any knowledge of your specific needs, it's hard to make a specific recommendation.

isn't it nice to get two replies to a question and they agree😏

I'd say maybe we're both wrong -- but since it was "Idris" that's not likely.

Yours was the better answer, though!