Trying to understand how Moze's skill trees work

[Cyber Akuma]

New to the game, and after having played hundred of hours of the previous three Borderlands games, it's a little confusing how different 3 is.

One thing I don't understand is how Moze's skills work. I know that I have five skill threes, and that I need to equip two of them on her mech, but what's not clear is if the abilities in those trees only work if I have the weapon from that tree active.

For example if I have the Minigun and Grenade Launcher equipped, if I spend a point on the Railgun skill tree will I still get that ability? Or do I need to have the railgun equipped in one of the slots for any of the abilities in that tree to work?

[Ch1oRinE]

Skills invested and mech weapons work independently. You can switch mech weapons however you like, skills you invested in will still work.

[Cyber Akuma]

Thanks, that makes this a bit easier. Was feeling overwhelmed with the 5 carousel-like skill trees that you equip on a mech.

[Lord Of War]

Cyber Akuma, things you need to know about BL3: active skills are very flexible. You can equip different weapons for your mech.

Basically, there's 2 weapon choices per skill tree.
You must assign main weapon and its variant.

Weapon 1 is the centred icon at the very top. Invest more points and assign weapon 1's variants from the left column (3 side icons).
Weapon 2 starts from the top right column, where you can see 4 side icons.

For a better illustration have a look here (online interactive skill points allocation):
https://bl3skills.com/gunner

You must unlock passive skills on the same level (line) for the weapons' variants to be able to use them.
------------------

A bit different story for the class mods.
Unlike BL2, if you equip an orange class mod (Shields of Retribution skill tree), but you didn't put any skill points into that tree - your passive skills from that class mod still work regardless.

Please do experiment with your mech/weapons, see what augments work best for your and have fun.