Npm start not working

See more:

react-native

> react-lap@0.1.0 start
> react-scripts start

npm ERR! code ENOENT
npm ERR! syscall spawn pwsh.exe
npm ERR! path C:\Users\Administrator\Documents\frontend\react\my-app
npm ERR! errno -4058
npm ERR! enoent spawn pwsh.exe ENOENT
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Administrator\AppData\Local\npm-cache\_logs\2023-01-02T06_50_15_101Z-debug-0.log

What I have tried:

I am learning react as there was first step to install nodejs and after it needed to run some commands like npm npx node but my npx command didnt work
after that I searched for it but didn't get anything then proceed further and ignored it .
then , I needed to create a react app by using command "create-react-app appname" then it also didn't work and again I searched and created react app offline by using command ....

npm install -g create-react-app- offline

crao -n <app-name>

after that I need to run npm start then it showed me error ...then after a search I get to know that I need to change directory where the files are present as my files where inside my-app and my-app was inside react folder then I changed the directory ... still got the above error ... I watched many videos but I was not able to find the solution.