I have used LibreOffice for years - originally in Windows and now on a MacBook. I use it mainly for docs and spreadsheets. It's completely free. I thoroughly recommend it.
There are extensions you can add if you want AI help

I guess Collabora may be better if working with others.

I do use AI quite a bit. - it does web searches much faster than I can but it often makes mistakes. It told me my car headlights are all H4 bulbs - I bought two. Then found out that it should be two H7s and two H3s. To be fair - it did apologise which is more than many humans do.