Where is the plugin explanations?

Do you have User Manual?

What is Image Lazy Load?
What is happening when I set V to this option?
What is Images Limit Size?
When does the limitation appear? When I upload an image to the server or when I enter an image to the page?

I somehow understand the Optimize Links.
I am lost in all of the other optimizations.

Can you help?

https://ww.wp.xz.cn/plugins/wp-optimize-by-xtraffic/