You can write your text online and then go to File > Download > Microsoft Word (.docx) to save it to your computer.
If you don't have Word installed, you can use Microsoft 365 for the web for free, or tools like LibreOffice and Google Drive which are highly recommended by the community. Community Perspectives on Word Alternatives
Go to the File tab and select New to start a blank page or pick a pre-made template.
If you are looking for a "good text" to put into a new document, here are a few professional and creative starting points depending on your goal: Professional & Creative Text Templates