Things to consider…
1 Screen size
A larger screen size of 27 or 32 inches enables a more comfortable experience. Smaller monitors, say around 24 inches, will save space and are often cheaper.
2 Resolution
The higher the resolution, the more detail the monitor can show. At this budget-level price range, most monitors will be 1080p (1920x1080 pixels resolution).
3 Inputs
Most monitors will come with HDMI and DisplayPort. While some Macs have HDMI ports, other Apple products don’t. To plug in a MacBook Air or iPad, get a monitor with a USB-C port, or use an adaptor.
4 Refresh rate
The refresh rate determines how responsive and smooth the screen is to use. It should be at least 60Hz.