To use Google Closure Library instead of Jquery, in Boot template I have to use :refer #{'hoplon.goog} in Hoplon Task. How do I do it in Deps CLI and Shadow-cljs? And How do I process .hl files?

i can't speak to the setup you're using since i do everything with boot, but all the hoplon lib does is give you functions that return dom elements - it is sugar over (.createElement js/document "div") or whatever you're using. the boot task just generates the html file for you, as i recall.

So, it's (hoplon) Task of Boot which by default includes Jquery, if we use Hoplon library standalone with other tools it won't include Jquery. Am I right?

correct, you will also not be able to use .hl files without boot

however we dont recommend that anymore anyway

How do you fetch data on client side? With Castra or Something like cljs-ajax?

with any client side library