Why can't I set up caching on armlinsoft.net?

Question

caching

Site https://armlinsoft.net/
I'm not quite versed in apache or ngix and I heard that caching is somehow configured differently there, but I usually enter lines in htaccess and caching works, but it doesn't work here.
Where to dig, how to make caching?
https://developers.google.com/speed/pagespeed/insi...