Since I bought a cheap one from TEMU for $9, A good site for intro: https://www.newworldencyclopedia.org/entry/Dizi
The one I received from TEMU is a G (though a little sharp) flute. It is jointless, so tuning would be a problem.
Update 1/30/2026, I found myself another D key Dizi on Pay-for-Less near our house. And this youtuber is a great intro into learning it: