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Don't reinvent the wheel
Look for existing lecture material you can reuse
Look for existing material in SlideWiki in other languages, which you can translate
Ask the original authors for permission to reuse and re-license (under CC-BY-SA) their content and acknowledge them as original authors
Good, recent text books are also usually a good basis for a lecture - inquire with the authors whether they would support a lecture on SlideWiki e.g. by providing you with the content in a machine-readable format