Integration of vue.js with laravel 5.4 and upper

I am new in vue.js and trying to work with laravel. I have some question regarding that. If anyone give feedback, then it will better for my learning.

1. npm run watch. Is this command necessary for every modification of my code? I am facing that issue. If I modify or add something , it doesn't show expected output. it shows [vue warn] Unknown custom: element ......
2. I've followed this steps to install. Firstly I install node js from https://nodejs.org/en/ . Then did npm install in command prompt. is this right way ?
3. When I'll deploy this project is shared hosting server, is this as-usual of laravel project deployment or more ?

Thanks is advance ....

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