==== fast forward a youtube video ====
You can fast forward a youtube video in 2x speed on the desktop by holding either the spacebar or the left mouse button. To achieve the same on the mobile, hold anywhere on the video.

See also: https://support.google.com/youtube/answer/7631406?hl=en-GB

==== do not show ads ====
<code>
https://www.youtube.com/watch?v=DuB8VUICGqc // will occasionally show ads
https://www.youtube.com./watch?v=DuB8VUICGqc // will not show ads
</code>

==== download audio only using youtube-dl ====
<code>
youtube-dl -f bestaudio "url" -o "%(title)s.%(ext)s"
</code>

Ref:- https://askubuntu.com/questions/423508/can-i-directly-download-audio-using-youtube-dl

Edit the audio (if necessary) For example, to copy the first 40 seconds of src.webm to dest.webm

<code>
ffmpeg -ss 00:00:00 -i src.webm -to 00:00:40 -c copy dest.webm
</code>

==== alternatives ====
  * https://youtube.com
  * https://lbry.tv/
  * https://www.dailymotion.com/ - https://en.wikipedia.org/wiki/Dailymotion
  * https://www.bitchute.com/
  * https://dlive.tv/

dailymotion was acquired by Vivendi (huge media conglomerate, owner of Universal Music Group) in 2016

==== dummy ====
When playing a youtube video in a browser, you can type 0 through 9 to jump to 0% to 90% through the video.

==== multiple channels ====
You can create multiple youtube channels with one google account. Go to https://www.youtube.com/channel_switcher and click on "+ Create a new channel" button.