What are the meta skills/PA's for HU/GU/TE/etc?

[Salavtore]

Again, i'm someone who played very casually but i realized i wanted to amp up my pace.

I've been looking into skills/PA's lately, but i find it difficult to pin point what ones to use. Like, hunter skills come in plenty, but i'm not sure which ones are more handy when it comes to bosses and crowds of enemies. (other than the default first skill)

If someone could recommend me or even direct to a guide on skills/PA for the following classes, i'd appreciate it.

Hunter (Specifically swords, unless partisans are better etc)
Gunner (Machine guns of course)
Braver (specifically katana's)
Techer (Wands, but i feel like i use normal attacks with TE/HU + wand lovers has the better DPS than skills.)

I'm also looking at those skills that tend to be used to get around maps faster too. (those that aren't necessarily used for DPS but used to move around faster, to sum it up) (I mean PA's too)