The glass has a high ability to absorb sunlight, and it is sealed, so the temperature in the small greenhouse can be very high, so you must remember to open some slits during the day to dissipate heat and steam. Otherwise, it is easy to overheat, steam, or mold.
If your small greenhouse is successful and you know how to use it, you can expand it in the future, and you can have proper plant production and harvest throughout the year.