Emperor Taizong of the Tang Dynasty Returns to the Tang Dynasty

I, an ordinary person, live an ordinary life. When I came home from get off work, I came across a ring at a familiar bus stop. I took it home... Put it on and traveled to ancient times. It turned out to be the Tang Dynasty! During the Zhenguan period! Tang Taizong! How to survive in the Tang Dynasty relying on modern knowledge? Is it making aircraft cannons? Or make trains and cars... I want to survive in the Tang Dynasty! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.