These notes are open source and contibutions are welcome. New materials and fixes to the existing lessons, bug reports, reviews and critical comments on structure and learning outcomes are welcome.
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The easiest way is to submit an issue to point out a spelling mistake, bad wording or a factual error.
You can also fork the repository, make modifications and submit them as pull request. In order to avoid unnecessary work, it is usually a good idea to create and issue first to discuss what changes to make and how.