Question / Help Audio Quality / Background Noise

Microphone : Blue Bird
Audio Mixer : AG06 by Yamaha

So I'm trying to get rid of the background noise while keeping the best audio quality I can. I'm wanting to know to get a higher level audio quality, are YouTubers and Streamers routing the audio through external programs like Adobe Audition? Or what VST's / Plugins are they used to achieve such a good audio quality.
 
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