What is the difference, advantage or disadvantage of using org mode in emacs? If there are advantages, would you like to explain how it is used and what codes goes into using it. I am new (3 days) to emacs and has just basic knowledge of LaTex! Regards
Giordano's comment highlights many of the benefits of using org-mode to generate LaTeX documents. The main disadvantage of using org-mode, compared to simply writing in LaTeX to begin with, is that it adds a layer of complexity when you want to customize your LaTeX.
In straight LaTeX, you can simply add a new header line, or whichever particular bit of markup you need. In org-mode, you have several options, including specifying header lines in org-mode keyword format, adding in-line LaTeX, or setting LaTeX exporting options via the Emacs customization interface. There's probably nothing you can't do from org-mode, but if you're familiar with LaTeX already, it's going to be a little more involved than what you'd do outside of org-mode.
For what it's worth, I'm switching over to using org-mode for most of my day-to-day LaTeX composition. If I know I'm going to spend a lot of time on the formatting, though, I write in straight LaTeX with AucTex instead.