For creating Word documents, PowerPoint presentations and to take with you (so that you don't have to be constantly plugged in)
You drive better with a good used laptop than with a cheap new laptop! Particularly in the professional field, very good and expensive laptops are taken out of service after 3 years and are sold by dealers in series.
Where do I find the?
There are dealers on ebay or amazon who offer the same laptops in all ages, prices and quality levels (so not privately!)
Or you are looking for an online shop that offers, for example, 'refurbished' devices.
https://www.esm-computer.de/gebrauchte-notebooks/?p=1&o=3&n=24
Or new with very good performance and also sufficient for your "demands" and a lot more.
300 euro