>>535730336
buy slots,prime frames you dont have yet,buy them in parts individually so you dont pay the convenience tax market has,never buy built weapons in the market,400p for some of them isnt worth it

then get deluxe skins you like

>>535730863
if it isnt a prime/prisma/wraith/vandal/dex/lich weapon/incarnon base and isnt on this list,then you can sell it
https://wiki.warframe.com/w/Weapons_Required_as_Crafting_Ingredients