How to Configure PPPOE-SERVER on a Cisco Router

PPPoE is a network protocol that allows two computers to communicate with a serial interface. This protocol was used before the 2000s. Nowadays dial-up connection is widely used.
This time we discuss how to configure PPPOE Server on Cisco routers starting from:
1. Connect a Cisco Router to the Internet (IP WAN, Route, DNS)
2. Configure PPPOE (Interface, Virtual Access, Virtual Template, IP Pool, Authentication)
3. Making PPPOE Privilege & Non Privilege users and their differences.
4. Configure NAT to connect the PPPOE Client to the Internet.
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[@grandsator9961]

You just save my company from a brink of destruction. Thank you!

[@RommelSucgang]

how to configure if my internet is dhcp?