It can also be writing code and publishing it on github with an open-source licence
The matter at hand:
Writing tutorials or documentation
🎉 It's easy ! 🎉
$ python
Python 2.7.12 (default, Jul 1 2016, 15:12:24)
[GCC 5.4.0 20160609] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print 'Hello world'
Hello world
>>>