Template messages vary in their placement. For example, a {{merge}} notice goes at the top of the article, but the {{stub}} message goes at the bottom. Read the documentation at the bottom of a template for instructions on how to make use of it.
An External links section, if any, should always be placed at the end of the article. It should always be spelled that way, never "External Links" or "external links". The term should be used even if there is only one external link.