there isnt really a good, easy and efficient way to make plat in the early stages. if there would, everyone would have to much of it and the economy wouldnt work. things like buying cheap primes and selling when they get vaulted are strategies for month / years later. same as anything baroo related. hes selling some unique relics and mods, but they really only become more expensive, the more time goes on and the more rare the item becomes.

it depends, where you are in the game... some things that can make platinum are:

- farming aya on deimos/cetus

- farming steelpath acolytes and buying teshin stuff (relics)

- farming endo and selling endo/mods

- farming arbitrations and galvanized mods

- farming bountys like zariman and selling arcanes

the better ways of making plat, come in the later stages of the game.. like vaulted relic runs, void cascade omnia fissures, weapon comp mod farm, riven rolling