Can I add Office on a 2015 MacBook Air?

How can I get Microsoft Word, Excel & Powerpoint on it? I had those on my Macbook Air early 2014 that just died.

Thanks!

The hard drive on my old Macbook Air died so my grandson gave me his early 2015 Macbook Air that has hardly been used. However, it only has macOS High Sierra Version 10.13.6

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