how to transfer files to new computer

I have a new computer and need to transfer important word documents to this new computer.

This has little to do with using LibreOffice.

But you might try this : https://www.makeuseof.com/tag/5-ways-to-transfer-files-from-one-computer-to-another/

or this : How to transfer your files to a new computer

or this : Using Windows Easy Transfer to transfer your data to a new computer

or this : New PC? Learn How-to Transfer Files from PC to PC - Transfering Data...