[bogomipz]

>"Any place that uses OpenResty (https://openresty.org/en/) is bound to use Lua not just as scripting aid but as a language to actually build applications."

This is not true at all. Where I work we use OpenResty in places for a WAF but we don't touch Lua for anything else. You don't need to know much Lua for this.

Using something as an embedded language is a little different than building standalone systems/infrastructure projects with something.