Getting Started with PCB layout Editor

Setting up PCB Layout Editor

Open PCB Layout Editor
Select Imperial Icon on left Toolbar for Inches
Research you PCB manufacturer requirements for board specifications  

Example for https://docs.oshpark.com/design-tools/kicad/kicad-design-rules/

For OSHPark  2 layer boards service with Imperial units options:
Min trace clearance: 0.006 6 mil (0.1524mm) trace clearance 
Min trace width: 0.006 6 mil (0.1524mm) trace width 
Min via diameter: 0.020 20 mil (0.508mm) 5 mil (0.127mm) annular ring  
(Corresponding to a 5 mil annular ring) 
Min via drill diameter: 0.010 10 mil (0.254mm) drill size 
Min via drill diameter: 0.005 5 mil (0.127mm) annular ring 

Setting up Design Rules

Select Setup from the Top Menu bar then select Design Rules
Select Global Design Rules Tab
Enter Min track width: 0.006
Enter Min via diameter: 0.020
Enter Min via drill diameter: 0.010
Add additional Tracks as seen in Figure 1 below.
 Track1    0.006
 Track2    0.008
 Track1    0.010
 Track1    0.012
 Track1    0.016
 Track1    0.020

  Figure 1

Setting up Boarder (Edge Cuts)

Set Grid: 10 mils(0.2540mm)
Select Edge Cut from the Layer Manager.
Select Place Tab on Top Toolbar then Select Dimension
Use this to measure the board size first. These dimensions can be deleted once Edge cut is complete.
Select from Right side tool bar Add Graphic Line
Draw lines to define you board Edge cut. When done change Select Front Copper F.Cu from the Layer Manager.

Adding Rounded Edges (Corners)

Select Edge Cut from the Layer Manager.
Select Add Graphic Art from Right Side Toolbar
Starting at top right corner. Count 10 dots back from each edge click one time with mouse. 
Then move cross hair to edge of board click again and swing counter clock wise.
Repeat for each corner. 
Now delete all four strait lines leaving only the 4 arc's.
Select Add Graphic Art from Right Side Toolbar and redraw the straight to each arc.
When done be sure to Select Front Copper F.Cu from the Layer Manager. 

Drill Holes

Select Add Footprint from Right side Toolbar (IC Chip)
Type MountingHole_3.2mm (preferred choice)
Type MountingHole_3.2mm_M3_PAD (Copper ground)
Type SolderWirePad

3D View

Select View Tab on Top Toolbar 
Select 3D Viewer from drop down

Reading Netlist and placing footprints from components

Select Read Netlist from Upper Toolbar. Click on Read Current Netlist.
Click on components and move to place on board.  
Now lets go to: ==Creating a component for KiCad Using SnapEDA == and add more components. 

---