Geometry Nodes

I’ve been trying to figure it out for a while and that wasn’t very useful, other tutorials used scale so they didn’t need to separate atributes, so that problem wasn’t apparent yet.
I know about those nodes but it’s not very clear how to limit that to a my vertex group, point rotate can be feed with that, but they will act as some weight value that isn’t easy to manipulate.

I tried diferent permutations, some made some sense, some didn’t, after I while I’ve been trying different things that didn’t make sense and are just permutations of trying different things. This last one even used the align rotation to vector which doesn’t seem necesary in my use case.