It is a pretty well documented strategy.
The economy in the games is subject to supply and demand. Everything is always just a little above or below "market price" depending on scarcity. Patch 2.0 upped the bag stacks to 9999, so get a few big stacks of something semi valuable but still easy to get, like cobalt. It can be mined in almost any cave and if you get a tetracobalt cluster, it can be refined down to more regular units. Mine or buy a few thousand units and then dump them at a terminal on a station. The price will drop like a rock and then you can buy it back at a fraction of what you sold it for. Plus buy what the station had. Then what the pilots in the landing bay have. Then zoom off to another system and repeat. The economy of each system takes hours of game time to recover, so going to new systems is better.
Plus you can use your new found loot to buy new exosuit slots at the exosuit merchant. More slots, more cobalt, bigger dumps, more money. When my total of cobalt became too big for the terminal (999,999) I switched to wiring looms. Same theory, more value per unit. The down side is that looms are stacks of 5, so they add up quick. I got lucky and bought 20 landing pod data things at a settlement, so I pumped those into my cargo slots and bought off the rest of my standard inventory and tech slots at new stations.
By the time I was at 300 million, each dump and buy was 300 looms, at roughly 10 million net per transaction. I just used to portal to walk through all the systems I discovered collecting cobalt. It was a little grindy, but not as bad as grinding in some MMORPGs.