How to optimize the code according to Google recommendations (caching, minimization)?

Question

css

There are some things that are not clear.
1) For example, how to use the browser cache for js scripts that are on the "Internet" (on other resources, for example https://mc.yandex.ru/metrika/watch.js )?
2) Is it possible to reduce (minimize) html, js, css in such a way that if it is necessary to edit the code, it would be normal. Well, i.e. so that I would give a minimized version to the Internet, and open the normal one for editing :) (do not suggest using plugins for editors, because the human factor will be mixed in - too lazy to minimize back or stupidly forgot)