"An extremely cheap laptop with a decent screen, but a severely outdated processor."
The 'Celeron N4000 processor' is a seven-year-old, dual-core mobile chip that is barely adequate for single tasks; expect visible stuttering when browsing modern websites or running a video call.
This is a potential option if the absolute lowest price for a large screen is the only factor. It could serve as a stationary terminal for a single application, like typing documents or displaying a static dashboard, where performance is not a concern.
Anyone needing a responsive computer for school, work, or general web browsing should avoid this. A refurbished, business-class laptop (like a used ThinkPad or Latitude) from a reputable seller will offer vastly superior performance and build quality for a similar price.