How can I use LODs?

My project is getting big…it’d be nice to tone down a few things I’ve over done…but would setting up LODs help? And if so…It’s something I don’t know much about…can I use it for anything? And is it as easy as just turning it on???
Or could someone point me in the right direction?

Hi!

Look this simply tutorial. It help you understand what is LOD, and how you can use it.