<p>That's my first 3d printer. I'm using Repetier Host as the brand recomends, and set all the configuration as the recommended one. I decided to print one STL file but the result is not the best one.
That's what I was trying to print:
<a href="https://i.stack.imgur.com/f1V22.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/f1V22.jpg" alt="handle"></a>
and that's what I've got.
<a href="https://i.stack.imgur.com/iPEfT.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/iPEfT.jpg" alt="cr*p print"></a>
Here you have a video of the impression. <a href="https://www.youtube.com/watch?v=HDdBQL44R3M" rel="nofollow noreferrer">it is a G2S pro rostock mini</a></p>

From the video it is very clear there is
a major problem with bed adhesion
.
It also looks like you are printing on bare metal (aluminium?) which I never saw anybody doing. I must admit I don't know it is impossible or simply very rare, but the first thing I would try in your case is
covering the bed in painter's tape
and wipe it with some alcohol
.  This is a surefire method to get good adhesion with PLA, which - from the temperatures shown in the video I assume is what you are using.
If you haven't tried this before, you should know that:
some brands of tape work well even without being wiped with alcohol
you may need to readjust your nozzle height after having applied the tape
Unless you have already done this, I would also suggest to print some
test cubes
and possibly some
stress tests
as your first prints, in order to check that the basics (extrusion rate, dimensional accuracy...) are working correctly, as well as getting familiar with the limitats of your printer.