Commands and environments

Commands

LaTeX documents behaviour can be controlled by using specific command. Typical command structure is as following:

\commandname[optional argument]{main argument} 

Note, that all commands must be proceeded by the backslash mark and the main argument must be included inside {..} pair.

Some commands have more than one arguments, for example:

\multicolumn{number of columns joined}{alignment}{content} 

Some commands do not need {} pair to work well, for example:

\item Text being item content

Some commands have option arguments, for example:

\item[--] Text being item content
\\[2ex]

Environments

A special type of command is the environment. Typical environment structure is as following:

\begin{environmentname}
 content
\end{environmentname}

For example:

\begin{center}
Sample text
\end{center}

or

\begin{enumerate}
\item First point
\item Second point
\end{enumerate}

Note, that all environments must start with \begin{environmentname} and finish with \end{environmentname}.

Some environments take arguments and optional arguments, like commands. For example

\begin{tabular}[table position]{column specifications}
 table content
\end{tabular}