Lines and brushes

Three lines in Paint
The Pencil tool
Straight line
Curved line
Line thickness
Choose the line icon
Choose a thickness
Choose a color
The line has been drawn as shown
Draw a curved line
Choose a thickness
Choose a color
Drag to curve the line
Horizontal, Vertical or Diagonal lines
The Brush tool
Choose the brush size
Choose a color
Position the mouse where you want to paint
The airbrush
Choose an airbrush option
Choose a color
Drag the brush