>$boost=XX—is used to alter the ranking of specific results by XX (e.g. $boost=1 would not alter the ranking, while $boost=2 would make a result two times more important).
But then we have this in the example:
>! Generic boosting
>rust$boost=1,site=rs
So this line is a no-op, because it uses boost=1?
In this case it is needed because there is a generic '$discard' rule in the Goggle (which means: discard any result that does not match any other instruction from the Goggle; you can see this as a 'default action' applied to results if they are not caught by any other instruction).
Using a 'boost=1' allows you to keep some sites, that you don't necessarily want to boost more than their "natural ranking".
We have a bit more info about that in the "Getting Started" guide here: https://github.com/brave/goggles-quickstart/blob/main/gettin...
I hope that helps!