I spent some time trading in Tau Ceti a while back - it has three stations. The first and third are...Industrial, I think, but the middle one is Agcricultural so you can take missions between the two different types. The innermost Industrial one is called Ortiz Moreno Station (and is owned by the Van Maanen's Star faction so there are plenty of missions here to get you faction with them if you want a permit) and the Agricultural one is Gilmour Orbiter. I think the outer one is called Graham Terminal or something but I tended not to bother going there as its market is the same as that of Ortiz Moreno as far as I could tell. So you can take machinery and stuff from Ortiz Moreno to Gilmour and then food in the other direction and the trip takes, I dunno, thirty seconds in supercruise? It's really fast, anyway, though there is a possibility of interdiction.
You also have TZ Aietis not too far away which is High Tech and you'll often see missions in Tau Ceti asking that you go there - you can pick up Performance Enhancers or whatever and take them back to Ortiz Moreno

. And it sells a whole bunch of ships and stuff - I upgraded my original Sidewinder (which has been parked there ever since) to an Adder en route to the Cobra which I also bought there and still fly

.
One thing I noticed started happening at one point was that when I took missions that needed me to return to Ortiz Moreno Station, the orange marker on the map would instead highlight an entirely different system (really far away and downwards, think it was in Empire Space). I got confused about that and checked the system details and it turns out that place
also has a station called Ortiz Moreno Station so it's telling me I need to go there, lol. Dunno why that started happening - maybe they added that station in a patch or something and the quest-destination-pointer thingy got confused because it always
used to point to the one in Tau Ceti. Still, doesn't matter - just ignore that if you see it

.