Monitor recommendations for Mac mini

Go to your local BestBuy or Electronic's retailer that has Displays on display and eye the options.

FWIW most any display and/or multiple display setup will work with the Mac mini.

see > Connect a display to Mac mini - Apple Support

Bonus: if your local BestBuy is an Apple Service Provider/Retailer, then ask the in store Mac specialist for some tips.

There are literally dozens available. Without knowing what features and specifications are important to you, it's pretty much impossible to make a specific recommendation. If you tell us what you're looking for - resolution, color accuracy, included ports and other features, etc. - someone can probably suggest something. For now, you can start here:

https://www.rtings.com/monitor

Regards.