There is a lot of partial information posted do far. I have been using Chromebooks for many years and Google Docs, Sheets and Slides are very good replacements for Word, Excel, and PPT. They will download .xlsx, .pdf, .csv etc. format so there are no issues not being able to access your documents.
There is also a "work offline" mode to allow working with and saving your files without being connected to the internet.
I should put a caveat up that I almost never use either Power Point or Slides, so that might not be as good as Docs or Sheets.