do I need to configure a Caching Server

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I am building a home PHP hosting server for learning.  I have a 
commercial connection to the Internet so no blocked ports and my ISP 
allows servers.

I believe I only need a Primary Master Server.  Is this the case?

My question is, do I need to configure a Caching Server?

In /etc/bind/named.conf.options:


         [...]

         forwarders {
              1.2.3.4;
              5.6.7.8;
         };

         [...]

Do I need to set the forwarders?

Thank you for all your help!!