Why does Google Page Speed ​​require something incomprehensible?

Question

css

Good afternoon - I ran into this problem. Google Page Speed ​​- began to strongly swear at everything, at styles, at js *
The site uses bootstrap - and Google page speed swears at it and other styles - what to do?
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Answer 1

Google says everything is correct, for the first time why are you shoving non-minified bootstrap files into the prod.
Need -
minification of all css + concatenation into one file
Same thing in js.
Next - if possible, make critical css for the first screen.
How to split critical css?
How to properly create critical css?