Via holes to connect a layer to another

[der.ule]

Yes

So lets add a few vias. Activate the routing tool (hotkey x ). Click on pad 2 of R2 (The GND pad of R2 ). Press v to add a via to your cursor and move your mouse around. Notice that you know have a via at the cursor which is followed by a trace back to your starting position.

from here:

Tutorial: Introduction to PCB design with KiCad version 5.1 (Getting Started)

Improving the Layout We did only use traces to define the connectivity in the first round. We still have a full second copper layer that we never used. So lets introduce copper zones and vias to the mix. You will additionally learn how you get changes made in the schematic back into the layout and will also learn how to change the unit used in a schematic to allow for easier connections. We continue with the previous result. For convenience here the project as it would look like first_project_s…