because I got some questions about it, I think 90% of the advice is just filtering out "WTS" in trade-chat. this keeps the majority spammers at bay and then you can just look for "WTB" messages.

Also beware the flippers; whenever someone has a list of items/rivens offering 100-200 plat for them they are probably trying to scam you. the most frequent ones I see most often are people looking to scam you out of your opticor, rubico, sicarus, lanka, and scoliacs. these are top dollar rivens that will sell for at least 500 each, higher if they have amazing stats. I actually got flipped out of my castana riven that way (though due to how DE nerfed their one practical use 2 weeks later I actually made out pretty well in that respect).

because I have a very high MR I make a lot of plat selling syndicate weapons as I can buy 3-4 a week due to capping out my sydnicates standing every day. if you're newer you probably want to use that for free relics instead.
also I can get "condition overload" to drop from transmutation which is also a nice chunk of plat; sadly this does take a shitton of credits which I collected a massive supply of back when the raids were a thing, and you have to have an excessive supply of gold mods you're willing to melt down.

as a newer player probably the easiest way to make plat is selling your veiled rivens and doing fissures. you can unveil your rivens too and might make a sale, but it is a lot harder.

ANYWAYS, holy shit that tennocon stream... I was quite impressed with the ship battles; I didn't think they could surprise me with anything, but a crew battle/raid is far beyond what I expected! I still miss the jordas verdict, but this is much more of an impressive thing right here. man looks like I'm about to loose another 3 months of my life to just maxing out there, but I'll have something to post something I worked on soon before that happens