Think about your face shape.
Figure out the brow shape you want.
Here they are on a person IRL:
Learn brow terminology.
Map out where your eyebrows should begin and end.
The measurements should look something like this:
Know your shaping tools.
And your fill-in tools.
Groom stray hairs around thick brows to add definition.
Choose a fill-in color that is one shade lighter than your natural brow color for a softer look.
Or choose a darker brow shade for a more striking look.
Fill in thin brows with a pencil or use brow powder and a brush.
Try using a brow stencil.
Wet your brow brush for a bolder look when using powder.
Get a refined but natural look with brow gel.
Use concealer to clean up the edges.