با سلام و خسته نباشید . بعد از نصب نکس . و زدن yarn dev ارور میده

yarn : The term 'yarn' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the 

name, or if a path was included, verify that the path is correct and try again.

At line:1 char:1

+ yarn dev

+ ~~~~

  + CategoryInfo     : ObjectNotFound: (yarn:String) [], CommandNotFoundException

  + FullyQualifiedErrorId : CommandNotFoundException

و npm dev هم میزنم

Unknown command: "dev"

Did you mean this?

  npm run dev # run the "dev" package script

To see a list of supported npm commands, run:

 npm help

این رو نشون میده