Technical basics of audio: connectors, signal types, power and so on

Описание: My humble attempt to explain some basic stuff for those who'd like to know more. Please note, it's definitely not the best possible explanation on YouTube, but it's my attempt to cover the following questions:
what are digital and analog signals
what sampling frequency and bit depth mean
what are different player's connectors are made for
how to connect your player to different audio devices
how to estimate is amplifier power enough for your headphones
what audiophile myths are true, and what aren't

If you have some questions or additions, I'll be glad to see your comments! Thank you!

Useful links:
What is decibel: https://en.wikipedia.org/wiki/Decibel
Sound pressure level examples: https://en.wikipedia.org/wiki/Sound_p...
Reference Audio Analyser calculator for headphones/amp pairing: https://reference-audio-analyzer.pro/...

Music by Kevin MacLeod (incompetech.com)