I have been hauling, which just involves buying low somewhere and then moving it elsewhere to sell higher.
Started doing station trading, which is buying low and then selling for higher within the same station. This works for people just wanting to dump their stuff, like miners, whilst people who actually want it will pay more for it
Eg set up a buy order for the repair systems skillbook for 20,000.01 (beating the guy below the guy below by 0.01), someone dumps the skillbook without checking and because I'm offering the highest I get it.
Then set up a sell order for the book for 28,000 (undercutting by 1,000 this time why not) and make bank.
Except 8,000 ISK minus fees isn't anything, but it's good for practice and in bulk it's a good way to do it
In the fluff one ISK is enough for a person to live like a king of they're planetside. But in the crunch I have 2.3billion ISK so I need more
I did make 3 million hauling a couple of cruisers but still eh, and I had just spent around that outfitting the hauler to carry them
Though I've been doing it with skillbooks and frigates thus far