Who are the "they" that haven't told you such "mind-blowing" (obvious) points?
All of this is
known to Climate Scientists, and is not hidden from the public either. Interesting, however, that the speaker doesn't quite put those facts in context. For example, the motion of the Earth does have an impact on the Earth's climate, but the relevant cycles last for periods of tens of thousands of years, so have no bearing at all on climate cycles over a few hundred years or so. Mentioning them is clearly sensible for the bigger context of long-term climate trends, but it's misleading to include them in a discussion on recent climate change.
With respect to the "no net warming in the 21st Century", this is also misleading. Firstly, that "hiatus" has already stopped, and the last four years have seen an apparent resumption of the trend for warming -- in particular, the last four years have been the hottest on record (since 1880). Secondly, the apparent pause was likely to have been partially related to El Nino, which magnified the temperatures in 1998 and therefore made the next decade or so look flat(ter) by comparison. Thirdly, there is now doubt that the hiatus even happened: see, for example,
http://science.sciencemag.org/content/early/2015/06/05/science.aaa5632.full
Finally, so what? Just because one year, or even a decade or so, doesn't show a marked increase in temperature, doesn't undermine longer-term trends:
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2009GL037810
I should also point out that "Prager University" is not a university, in any sense of the word, and is better thought of as a conservative propaganda channel. A reasonable and balanced source it is not.
I could debunk the remainder of the claims in the video, most of which are based on true statements that are then taken wildly out of context, but the simple fact is this: the climate is changing, and human activity is a major driving factor in recent trends. The debate on this point is very much over, as a meaningful scientific exercise.
Seriously: stop doing your science research by looking at YouTube vids.