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It’s… complicated, but makes more sense once you see it firsthand. Melee weapons also get a Stance mod slot, while Warframes get special Exilus and Aura slots that can only equip certain mods.
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Every item can have up to 10 “normal” mods. Meanwhile, mod slots define the total number of mods you can equip on a given item - regardless of total strength. So if you have 15 total mod capacity, you can equip three level five mods, or five level three mods, or any other sum up to 15 total strength. Mod capacity is the maximum sum total of every mod’s strength that you can have equipped on an item. It’s also important not to confuse mod slots with mod capacity. For more information on that, check out our Upgrading Warframe Mods Guide. There are other ways to increase your mod capacity - even beyond using Catalysts and Reactors. If your weapon starts with a minimum mod capacity of four, for example, but your Mastery Rank is 11, the weapon instead starts with 11 mod capacity. This gets easier as you play the game, however, since your Mastery Rank (the overall level of your profile in Warframe) overrides all items’ minimum mod capacity. Items level up as you use them, increasing their mod capacity over time, until you reach the maximum of 30. An items’ starting mod capacity is relatively small, however, and only allows you to equip one or two basic mods at first. You can then double this with an Orokin Reactor (an item used to buff Warframes) or an Orokin Catalyst (an item used to buff weapons). Every item starts with a minimum mod capacity that eventually maxes out at 30 as you level it up. This limits the number and strength of the mods you equip.
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