Why I need 2 uv map (Lightmap)

Development Rendering
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1

Hi I Try understand why I need Light Map for my model ? Can you explain me, it is important ?
Unreal Engine 4 Tutorial: 2nd UV Channel (english) - YouTube This tutorial is good explain to create this ?

2

you need it so that shadows can be placed properly on the mesh.
that tutorial is good, additionally this one: Lightmap Creation for Unreal Engine 4 - YouTube is good too.
good luck!

3

Thank you !
I have last question for person who use blender and UE4.

221040-screenshot-2.png
221040-screenshot-2.png1816×773 153 KB

So this UV light map is ok because i have only sharp edges ?