The extremely weird mechanics of operator amp damage against Eidolon shields, uncovered and explained (long post, TL:DR at bottom) : r/Warframe
WARFRAME] DO MORE DAMAGE! - Ultimate Gun Modding Guide - Learn How Damage Works! - YouTube
Warframe Mods Guide: Mod Capacity, Polarity, and Damage Types
Saryn Prime Miasma Damage Calculator. Use this to see what rank transient fortitude should be at for your Miasma to do the maximum total DoT possible. Just a tool for Min/Max players :