The "new" and "advanced" Steam Security System has caused too many troubles so far. Valve has to understand that not everyone who uses Steam Aplication for Gaming, are able to buy a Smartphone. In my case, luckily i have a smartphone, still luckily, my smartphone does not support Steam Official App. I've tried using BlueStacks, Android Emulator and IOS Emulator, but none of these options are viable. I play a lot of TF2 Daily, and trading has become a very common thing to do in TF2 Community. The solution? Steam Desktop AU.

Getting Started - Desktop Authenticator!
Desktop Authenticator is a home-made app for Desktop ( Runs in Windows 7,8,10, Mac, Linux )
Desktop Authenticator its a song for our Ears, its simply perfect! He does everything the smartphone app does and a little bit more.

• Go to this site https://github.com/Jessecar96/SteamDesktopAuthenticator
  
• Go to ''Releases'' tab
  
• Tip - ''Releases'' tab is Next to ''Comments'' and ''Branch''. If you play TF2, There's a name tag symbol on it
  
• Download the file named ''Steam.Desktop.Authenticator.v1.0.0.zip'' ( You can find the source code below )
  
• Unzip, And start ''Steam Desktop Authenticator''
  
• Go to ''Set New Account'' and Add your account to the program. And yes its safe
  
• They will send a code to your email ( Email you used to create your Steam *NOT THE USER*)
  After recieved the Code, put it into the app
  
• Put a real cell phone number, You will recieve a code ( Any cellphone should do it )
  
• *OPTIONAL - Set a passkey for safety. Or not!
  
• Write the Revocation code somewhere (He's really important)
  
• Type the code from the SMS ( Check the phone dude jeez )
  
• Type your Revocation code in the bar.

Done! Your Steam AU. is ready to use
Try opening your Steam on the browser and logging in ( It should ask a Code from Desktop AU.) Open the program and use the code.
Important - To confirm trades you need to

• Open The Program and Click on ''Trade Confirmations''

Important 2 - Leave the trade confirmations ON

This guide has reached its end!
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And as always, Stay Awesome