You were just unlucky buddy - I trade explored with companion and it all went just fine
Just scrolling through systems seeing what gives good money $hr
You managed to run into some of the most annoying things in the game, there aren't that many dead jump holes and undockable planets for large ships
Anyways I sent you 130 million so you can get yourself a larger transport
For a beginner I'd recommend "Kusari Tanker" bought at Planet Muira in Okinawa
- it has 4700 cargo and no guns, but is great in tradelanes and you won't get stuck often (and very cheap, not to mention just gorgeous)
One always stocked is Player Own Based "Bristol" in bering
Where you buy military salvage
Take jump hole to Hamburg
and then set waypoint to "Sarcelles Shipping Facility" in Ile-de-France
Then move to a player own base "research facility" or something like that here
buy molybdenium ore
And set waypoints to New Berlin
And then you go back to bering and do the route again
You can also take Rheinbier to Planet hamburg on the way to Bristol Player owned base, it tends to be full but you can sell it on Planet Hamburg for a small profit, you are going next to it anyway.