I tried many times, but I was not able to replicate a shape that I want.
The attached SVG is the shape I want to replicate on a Sketch with Splines by myself.
Before I was importing the SVG and converting it to a sketch. But it thas an elevated number of points that I want to simplify by making my own shape. And also, it is not imported with the lower-left corner on the 0,0 by default. So it is also hard to move it on the canvas.
First of all, the tutorial has these "Open B-Spline" and "Closed B-Spline" naming (page 30). The software names them "B-Spline" and "Periodic-Spline", except by the icons the tutorial has better names for these things, at least for me.
Also, the exercises in the tutorial are really good to start doing something useful.