Learning to sing is taking control of your voice. You use the same biology that you have been using for speech and other vocal sounds since birth. It all comes built in. Of course it comes more naturally to some people, just like any other activity.
There are some decent videos on YouTube, but take actual vocal lessons if you can. Videos are not a substitute for lessons.
I don‘t like the posted page. The descriptions aren‘t very helpful and neither are most videos on YouTube. I know from experience. For a complete beginner, this is frankly a useless resource.