As topic. I want to ask is it possible to remove query in resources?
And also why ghost uses query? Is the resource changing frequently?
From GTMetrix, it suggest me remove query following for like JS resources
Something like /asset/js/libraries.js
Yep
OK, so you’re referring to how assets are loaded like this:
<link rel="stylesheet" href="/assets/built/screen.css?v=ab22cddc39">
The ?v= query param here is for cache-busting so that when you upload a theme change or switch themes your changes are actually seen by site visitors instead of a proxy/cache or your visitor’s browser cache keeping the old version of the file around for up to a year.
The GTMetrix recommendation is just that and in my opinion is out of date - I haven’t seen a cache which doesn’t cache files with query params for many years. Best advice is to not follow these sorts of tools blindly; find out why they are recommending certain changes and whether those changes come with downsides 
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