Answer 1

Kode Krasher Webpack is not too hard to master.
You could try to go through the getting started portion of the official website.

Try to at least study and practice the first 2 articles, Getting started and Asset management. (Not a long tutorial)
https://webpack.js.org/guides/getting-started/

https://webpack.js.org/guides/asset-management/

With the first 2 articles already enough to cover typical bundling js works for many web applications.

Of course, if you can go through all the tutorial articles, you would be at least using webpack to bundle any web codes without much issues.

If you really want to master webpack and babel, follow this guy tutorials from youtube.
https://youtube.com/playlist?list=PLmZPx_9ZF_sB4orswXdpThGMX9ii2uP7Z