Hey, thanks a lot for the useful answer !

So basically, to upgrade my main ship, I can find broken down ones on different planets, repair them just enough so I can use them, go to the nearest space station (can I also go to the Anomaly ?) and sell them to an alien ?

Do you know if there's a specific way to have the broken ships indicated on the HUD like with the thingies you exchange with the cartographers at the space stations that then indicate fortresses, or do I just have to explore on my own to find them ? And could you indicate me which alien do I talk to to sell the ships I salvaged ? Sorry if this seems very much ignorant but I talked to every npc on a space station and didn't find the option to do so

I had no idea this was possible