I have Argosy stationed in a system and I've been using it with a Faering ship for the sake of exploring (while I wait for the colonization moment with Argosy), should I explore freely the universe to reveal as many systems that I can or should I be more discrete and keep only a few systems revealed? I'm afraid the more systems revealed, more enemies are going to react according to the revelation, that is, if I reveal a major faction, this one is going to make agressive moves against me, whereas, if I don't reveal it, I can take some more time to develop my systems. I don't know if endless space 2 is the same concept of 4X territory (nation) conquest where you expand your territory after consolidating the one you already have and don't go too further invading another cities (administrations which have the possibility of having an enemy).

I see. This can be a pain then, starting unnecessary fights too early only to need to spend resources to repair ships afterwards, recover troops, etc. My playthrough has 8 major factions, certainly I'm going to face at least one of the factions you mentioned sooner or later and it's going to be a mess if I face one of them in the beginning of the game.

Befriend Pirates if you can. Having a portal on every pirate layer is really strong as vaulter and helps avoiding confrontation.