Paulina 9c4e3956a7 Correction and editing of the tutorials.
[80 %] English version
[0  %] Polish version
[20 %] Both version consistency check
[0  %] Final sanity check

TODO:
- comments in the code blocks
- side-by-side consistency check
2020-02-29 10:31:52 +01:00
..
2011-12-31 01:28:41 -05:00