I've just started playing WarFrame and as usual in free-to-pay games there is some currency that you can buy for real money - platinum - of which I got 50 from start and I probably won't get more soon(without paying real money).
My question is:
What are the options of spending exactly those 50 platinum for person who just started playing the game or would you recommend keeping it for later use and why?
Also I've heard that I can get more platinum by trading stuff but is this only via the trade channel or are there any auctions etc? Or can I get any platinum from selling stuff to NPC/world/game?
I hope reformatting the question made it less opinion-based and it didn't make any of the current answers non-related.