1. Starch can be temporarily replaced by corn flour, lotus root starch, flour or horseshoe powder, but the effect is far less than that of starch.
If you are in a hurry to use starch, but you don't have it with you, you can take out two potatoes, peel them, wash them, cut them into shreds, soak them in water for about 30 minutes, and then take them out. Then, let the soaked water stand for about 10 minutes, and pour off the clear water on it. Below is water starch, which can be temporarily used to replace starch.
3. Starch does not refer to a single kind of powder, but generally refers to it. Common edible starches in life include sweet potato starch, corn starch and potato starch. The starch used in vegetables in different places is different. For example, northern Shandong cuisine mostly uses corn starch, Sichuan cuisine mostly uses sweet potato starch, and raw flour is similar to starch, but the purpose of raw flour is mainly thickening, while flour is sticky.
All of the above are about what can be used instead of starch.