When you first start playing Warframe, every new weapon is a blessing. It’s something new to try out as you get to grips with the game. Over time, you will find you like some weapons and dislike others, as you find your preferred playstyle. You might also end up with too many weapons and run out of slots. There are two solutions to this, which is to sell some weapons or buy more slots.
How to sell weapons
To sell weapons, you need to open the main menu, then go to Equipment. Click on the Inventory option to browse all your items. Use the icons at the top of the screen to choose Primary, Secondary, or Melee weapons to see everything that you own.
Clicking on any item or weapon will add it to the list on the right side of the screen, and there will be a button to sell the items at the bottom. You can add multiple items to the lists, or feel free to go through your inventory and get rid of anything you don’t want. You will earn some credits from selling items, but no other resources or currency. Each weapon you sell will free up one weapon slot.
How to buy new weapon slots
Weapon slots can be purchased from the Market module in your Orbiter. They cost 12 Platinum for two weapon slots. There are many ways to get Platinum, and it is quite easy to farm some items that you can sell to other players and get enough for the weapon slots.
Rare mods, Prime parts, and Riven Mods can all be sold to other players for Platinum through your Clan Dojo.