read through the present chapter and write down anything you did not understand.
Also here, there are some clips for more clarification under 'Embedded resources' (check the text above/below, sometimes only part of the clip is interesting).
For checking your understanding please do the following exercises:
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90-minute plan
Warm-up (x min):
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Core concepts & derivations (x min):
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Practice (x min): …
Wrap-up (x min): Summary box; common pitfalls checklist.