All electronic devices generate hiss. Let's explore what to do to prevent it getting on to your recording. 
I forgot to mention that another way to reduce hiss is to use better equipment or connections. So to eliminate the hiss I get connecting my mic to my computer via USB - I can connect my mic to my digital recorder (Zoom H6) via XLR cable and then my Zoom to my computer via USB. The quality of this chain is much higher and there would not be any noise. 
Also I forgot to mention Auphonic.com as a great tool to remove noise. They will gift you two hours of free sound processing per month. 

PRODUCTION NOTES
Recording Mic: Samson Q2U Dynamic with pop filter and foam windshield. 
Recording device : Dell G7 Windows 10 Laptop via USB
Recording location: Sitting at dining table - no pillowfort but fairly non-reverberant location with soft furnishings and bookshelves.
Recording app: Audacity for Windows
Recording format: WAV (16 bit stereo)
Sample rate: 44100Hz
Editing app: Audacity
Sound Treatment: Auphonic Productions at Auphonic.com
Auphonic.com settings [to output as a 16bit mono WAV file]: Adaptive Leveler (on), Loudness Normalization (Loudness Target -19 LUFS ), Filtering (on), Noise and Hum Reduction (Reduction Amount: Auto), Sample rate: 44.1kHz
I uploaded the resulting WAV file to Anchor.fm to host the file and added the music from their free music stock.
Anchor automatically converts the WAV file into a 128kbps .m4a file

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