configure oracle virtualbox for linux operating systems communication

the language of this tutorial is Persian.
type of issues has considered :
NAT
SWITCH
type of static IPV4 on ubuntu-server 20.04, ubuntu-server 16.04, CentOs7-minimal, ubuntu-desktop 16.04
Add additional NIC (network interface card)
How linux Virtual machine communicate with each other
different between range IPV4 in mobile Hotspot and ADSL Router

source

centos 7