How to solve below error for sp 2013 on premises setup

Question

I am setting sharepoint 2013 single server farm for training and learning purposes and while clicking on "Promote this server to a domain controller", i am getting error, please see below screenshots.Can someone please assist?

Answer 1

In short, The forest root domain name consists of two parts prefix.suffix, you are tried to set the forest root domain name to a single label domain name so you got this error!

Read more about Assigning Domain Names

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In your case (Learning environment), try to set forest root domain name as

 sp2013.local

Note: Installing the AD role on the same Standalone SharePoint server will work but it's recommended to install the AD role in an independent server (VM) to avoid the performance issue.