**https://youtu.be/LHY9cm_2zwU**

Horizontal

Horizontal constraints define how a layer behaves, as you resize the frame along the x axis.

• Left maintains the layer’s position, relative to the left side of the frame.
• Right maintains the layer’s position, relative to the right side of the frame.
• Left and right maintains the layer’s size and position relative to both sides of the frame. This may cause layers to grow or shrink along the x axis, when resized.
• Center maintains the layer’s position, relative to the horizontal center of the frame.
• Scale will define the layer’s size and position as a percentage of the frame's dimensions. It will then maintain those proportions as you resize it.

Vertical

Vertical constraints define how a layer behaves, as you resize the frame along the y axis.

• Top maintains the layer’s position, relative to the top of the frame.
• Bottom maintains the layer’s position, relative to the bottom of the frame.
• Top and bottom maintains the layer’s size and position relative to the top and bottom of the frame. This may cause layers to grow or shrink along the y axis, when resized.
• Center maintains the layer’s position, relative to the vertical center of the frame.
• Scale will define the layer’s size and position as a percentage of the frame's dimensions. It will then maintain those proportions as you resize it.

• You can't apply constraints to groups. A group will inherit its bounds from the layers contained within it. They aren't considered a single layer with bounds.