quick question, bc I didn't find it, and didn't really know where to look on game, ig you have 2 of the same module, does their effect stack? like 2 armor platings, if one is +5 and the other +15, does it add together? or take larger one?

Yes, it does stack. You'll notice when you take one of the plating off your hp or whatever decreases and in turn when you put it back on it increases.

okay thanks

Not all modules stack though.
Resistance modules don't stack with resistance modules of the same time, or with multi-resistance modules.

But don't worry if you buy modules which wont stack, because if you sell an item just after buying it (i.e. without leaving the shop) you get a full refund.