A screencast quickly summarizes what would otherwise take longer to explain. For example, we used a screencast to show how our library users can download free music (libraries are great for that)!
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The main common support for whichever Linux Distribution is being used, is the internet: websites, blogs, forums, screencasts on youtube, user groups, ebooks and printed books, and so on.
For simple tasks like voice recording for podcasts or screencasts you can use the micro-in of any computer with an up-to-date soundcard. For rather demanding voice recording like singing you should use a special recording device like a USB-Microphone or a digital voice recorder. To process the audio there are various free and open source programs like for example audacity.
You have to create a tunneled connection out of china which is actually really easy. Find a proxy such as Ctunnel, Hot Spot Shield, or Tor and use them to access information that is blocked in China. I wrote an article on this topic here with three screencasts to walk you through the process: http://www.laowise.com/blog/category/3
For Windows and Linux, the best screen recorders are ScreenRec and OBS for sure. There is no doubt in it that these software are best for free screen recording without watermark. YouTubers' favorite is ScreenRec because it records tutorials in most professonal way. Toggling sound input (internal or external sound) is super easy with ScreenRec, that's why it is being utilized by hundreds of thousands of YouTubers.
You automatically have a YouTube channel when you sign up to YouTube but it can be a daunting exercise to decide on what niche you would like to go into and how to get subscribers. I have done research and came across a training course which guides you step for step in how to make money from YouTube. click or paste the link in my bio.