What links or texts can I put in the item description, demo and downloadable package? - Best Premium and Free Responsive WordPress Themes from Template Sell

To make TemplateSell a great marketplace for all of the buyers and vendors, we require the vendors to follow some best practices in inserting URLs, writing descriptions, creating preview pages and preparing the download packages. What we treat to be okay include but not limited to:

      If you use assets those are required to be credited, you can mention the source and link to it.
      You can provide links to online documentations or support forums.
      Relevant social media profile links are allowed.