Best Location to farm good Mods

[Helmi]

Hi..
Someone know locations to farm good mods, or they are really ramdom drop? (T4 and upwards)

[Fulgen]

T5 planets and farm chests or T5 systems and farm shipwreck in space, I've had better luck in chests (still a rare drop) but both work.

Chests needs keys shipwreck don't, chests have overall better loot (more ressources)

[Oragepoilu]

You can buy key in bulk if you find a trader on a planet (good luck with that, since pirate base don't often swap for a colony once you clear them), so take note of their location, and/or place a portal here before taking some note on a paper.

Once you have plenty of key, just loot chests (farming t5 at least let you sell useless weapon for good money, allowing you buy more keys and whatever ingot/ore/stuff you are missing right now). With a modding station you can remove a single mod from some equipment, but you destroy it during the process.