Active Directory, Group Policy and DNS guide/tutorial

I require  a basic guide or tutorial for understanding and functioning of Active Directory, DNS and Group Policy please.
cgeorgeisaacAsked:
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yo_beeDirector of Information TechnologyCommented:
In short you need to look at your AD as a means of organizing and managing your domain. All three you are inquiring about are all intergrated to allow you to centrally managed and easily distributed.

AD: it's a Database of Users, Computers, Security Groups, Distribution Groups, and many other system objects.

DNS: Is heavily integrated with AD.  Domain Name Service (DNS) is how you resolve domain names to the IP-ADDRESS assigned to the name.  So whnen you type google.com (173.194.121.17) or microsoft.com (23.77.148.100) there really is an IP-ADDRESS associated with it.  This allows you to easy reference a machine or web address without having to remember the long number sequence.  You can not have a AD without DNS they work hand in hand.  When you install and setup AD you are required to setup a DNS.

Group Policy:  This is your ultimate tool when you setup a AD domain.  This is how you will manage and apply setting to computers and users in masses rather then going to each individual's computer.
It's name says it all.  You can target certain groups while not affecting others.

There is so much information to really explain that you will need to search for each of these topics individually.

I found a link the may help explain AD in a semi-short article
https://zappytech.wordpress.com/2013/03/19/active-directory-basics/
http://www.dashsystems.com/tip_dns-explanation.cfm
https://www.youtube.com/watch?v=ccHpEyl6Vnk
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