Hello, I would like to ask where are the interesting attractions and cost-effective hotels in Nagoya, thank you

The most worthwhile attraction in Nagoya is Oasis 21. If you are interested in Toyota, you can go to the Toyota Industrial Technology Memorial Hall and the Toyota Museum. In fact, most tourists arrive in Nagoya to go to the Hokuriku area, such as the famous Gero ( Japan's famous hot spring town), Japan's secret place Shirakawa Township, Japan's well-preserved ancient buildings group Kanazawa (as famous as Kyoto). You can choose the hotel near JR Nagoya Station, which is convenient for transportation, eating, drinking and shopping. I don't know your price point, so I can't recommend the name of the hotel.

If Nagoya is just to transfer and stay, if you want to go to Gero, Takayama, Shirakawa, Kanazawa, you can consider staying in Gifu, the hotel price is much cheaper than Nagoya