How hard is Javascript?

So javascript runs in the browser, not on the server?

Correct, because it's a client-side language.

You don't need a webserver running anything special to load an HTML/CSS/JS page. You can just write one in Notepad if you want, and open it up in a browser from your machine and it'll load/render just fine.

Something that uses a serverside langauge however (like PHP, Python, C/C++, C#, etc.) all require an actual webserver for the page to be able to load/render.

You can open up the Dev Tools in your browser (press F12 on your keyboard), and you can view the JavaScript for the current page either under the Elements tab or the Sources tab and then browse the folders/content and open the .JS files. You can also run JS commands in the Console in the browser and it will do operations just like the browser would render it.
 
Javascript is easy in understanding. You can get the job after two or three months of sudying. If you want to become a midle developer in three months, read David Flanagan's book. It's really hard in understanding, but good salary demanding good knowledge background and skills!
 
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