I just started learning LaTeX, and I'm having trouble to write a symbol, LaTeX.

I just started learning LaTeX, and I'm having trouble to write a symbol, LaTeX.

Just write it as follows:
\documentclass[12pt,a4paper]{article}
\begin{document}
\LaTeX
\end{document}
The output is:

\LaTeX, not\LaTex. – Przemysław Scherwentke Aug 02 '14 at 00:30