We Shall See

Here's a good conceptual overview.

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Cluster_Logical_Volume_Manager/LVM_overview.html

Quickie guide with pictures.

https://www.howtoforge.com/linux_lvm

Interesting details.

https://ostechnix.wordpress.com/2013/02/03/linux-basics-lvm-logical-volume-manager-tutorial/