This is so people can message you while you're ingame to purchase your stuff. When you get Corrupted Mods (or anything else) then you can sell them on (it's a great website for selling/buying/ price checking things) which you'll want to make Sell Orders (after you make an account on the website) and leave the website open while ingame. This is the general lingo of recruitment chat, so learning what stuff means will help you out in the future) Generally in LF people will want certain keys or frames to be used.
You can do something like H Vault Runs 1/4 ( H = Hosting, LF = Looking For. Just be sure to get a group of people in recruitment chat with the other Dragon Keys. Not only are the mods nice to sell, but they can also be used for more endgame builds and having them is a good thing overallīe sure to watch the video below on how to get to the Orokin Derelict, how to get Dragon Keys, and how to search for the vault which will be opened to obtain the corrupted mod. Vault Runs are easy and you don't really need to have anything special or be a high MR to do them, hell even an MR 0 can do them really.
To start making platinum for yourself you can start doing Vault runs in the Orokin Derelict.