Load balancing and Redundancy for exchange 2016

Hi All,

I’m a newbie . Currently, I want to configure Load balancing and redundancy for exchange 2016. Could you please help me any guide or further idea for this ?Can we use layer 7 or layer 4 ?
Also, we can use Let’s encrypt ?
Thanks in advance to help me. I don’t have much knowledge for linux. please don’t laugh at me.