Hello there, @opweinijieleini ...
In addition to the great tips you've gotten from @gnoack and @KristinL already today, I would also recommend checking out these awesome videos from Ashlee Espinosa on YouTube. I've not watched all of her videos, but she does a great job of explaining how Canvas works and how to set up different parts of your course. You can find a complete playlist of her videos at:
Canvas LMS Tutorials for Online Teaching - YouTube
Hopefully some of her videos will be of help to you as well.
As always, keep those questions coming. There are tons of Community members here ready and willing to help you along the way. Glad you've chosen to join the Community!
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