How to insert html tags to a node content? I am wondering is it possible to insert a plain full html tags to a node content? Currently I have a node content type having a list of fields, but if I add some html tags in tpl.php file for that node, the html tags are actually outside the main content of the node field (but I want to put new-added html tags inside that.)

Can anyone brief me what is the best way of doing that?

Regards!
To use html tags in the Body field of a Basic page content type (for example) you need to select "Full HTML" or "Filtered HTML" in the "Text format" dropdown menu below the input text box (see image). As far as I know, only fields of type "Long text and summary" and "Long text" allow you to select Full or Filtered HTML. 

To configure text formats and permissions go to Configuration -> Content authoring -> Text formats (www.example.com/admin/config/content/formats). 



For more information see Text filters and Input Formats.