In order to trade you can use the trading chat type H [name] price , and Lf [name].
Dojo is another option for trading too
I thought it was WTB for "want to buy" and WTS for "want to sell. Seems a lot have changed since my computer destruction.
Most useful method for trade is Warframe Market. İf you want to buy riven, go to Riven Market or trade cht
Community chat helps too.
There are players iw Warframe who buy literaly every prime part you have for an aranged sum. They are usually loaded with Platinum so you can use them as trading buddies.
Group/communities created for trades might be easy too.
You can just leave a msg and you won’t even have to be online to wait.
Just check again when you can, then talk about the time you can actually trade, and the price of course.
Warframe market is go to for me, got over 400 platinum in a week
that’s alot. might have to check it too