CMS Some questions about the tag 'raw' and other things.

[محروم.كوم]

Hi,

i'm trying to learn the CMS and other things profoundly. Now, im trying to learn the code behind - how to edit the output. So i've learned the stylevars, little in the templates, but i didn't understand some things.

Now im tring to customize the header. You know, the navbar, logo, etc. I saw in the template 'vbcms_page' some things i dodn't understand. the {vb:raw ***}, Like {vb:raw header}. I thought it is the template 'header', but no. 'raw' isn't a templat.
So what is it?
and, if i want to customize thigs like the navbar. Should I create a template, or how to do it?
Is there a guide for all those things? I saw the guides in the blogs here, or here, but they aren't explain those things.

Tnx. __DEFINE_LIKE_SHARE__