Solidworks Tutorial for Beginners #11: Splines. 
The objective of this tutorial is to introduce to you the different types of spline tools.
At the end of this tutorial, you would be able to sketch using the Splines, and also edit its geometry using the different methods available.
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To access the tutorial playlist: https://www.youtube.com/channel/UCI-7KFfWRon1VfK0Z2v879Q/playlists
Step 1: Solidworks Tutorial for Beginners #11: Splines.