With these, you rarely need any other mods as they are a complete holistic package with a singular vision. Total Conversion Mods are giant behemoth mods that tweak almost everything about the game.
Ranked by number of subscribers on Steam. They will have separate instructions on their respective pages on the Paradox Forum.
There are some mods that are too large for Steam Workshop. It's there that you can choose to activate or de-activate mods. Simply go to the Steam Workshop for EUIV and any mods you subscribe to will automatically be downloaded onto the launcher. So instead of gawking at the sheer quantity and quality of mods, let's look at how easy it is to enhance the vanilla game via four key categories to get any megalomaniac started on a fuller EUIV experience.
Thankfully, it's hard to go wrong with the quality of the modding community for EUIV as they've made the game almost infinitely replayable. With over four thousand mods, the top one hundred of which having between 10K - K subscribers, trying to tweak your Europa Universalis IV game can be intimidating.