conditional expression in TeX

Question

User case: This is what I have in mind. I am preparing a contract written in tex. I would like to specify in the beginning of the contract whether this will be an open contract. if so, I want text to add section{ABC}, if not, then section ABC is not executated.

I know there are similar questions asked, but to be honest, it is too confusing and I still don't know how to proceed after doing my research. I assume I should use \if primitive?

Some pseydocode I have in mind

\newcommand{\opencontract}{TRUE}

...
\if \opencontract=TRUE
\section{ABC}
***
\fi
...

Answer 1

\newif\ifopencontract

in your preamble then

\opencontracttrue

or

\opencontractfalse

then

\ifopencontract
  whatever
 \else
   foobar
\fi

in conditional sections