How does react project starts

 in react project 

all projects bundled into a single file and then placed into server

npm run build

app.js, index.js, filed.js translate.js ==> bundle.js 

also called as app.bunlde its called some identifier.js

every react project is meant to develop html 

server request , in response it load html page and taht will be showin in ui

if need links or some other omponnetn 

that hetml page tells fetch from server 

so the browser send a second request to server 

and give thebundle file to browser

public /index.html

src/index.js 

index.html id ==root

in index.js id == root

which ide is related that id onl y it wille xecutes

index.js 

i tis the first file executed in react

===

bundle.js

====

when index.html started loaded on the browser

inside the bundele it has index,hs

index.html root had indcated in bundle,js root

bundle.js telling it has root id , we have to access root id in index.html