Helvetica is a rather popular font, but due to its license, it’s not available on all platforms, e.g. Debian/Linux. There are a few alternatives, though.

As we can see, both Free Helvetian and Nimbus Sans L are pretty close. Nimbus Sans is slightly thiner, but works perfectly as a substitute. (Actually, Nimbus Sans is the substitute for Helvetica on my Debian/Linux.) Even though the first two share the largest resemblance with Helvetica, they are only available in PostScript (pfb) format, which has been mostly rendered obsolete by OpenType. Therefore, I suggest using Nimbus Sans as the alternative to Helvetica.

The source of the pdf is shown below. One should compile it using xelatex main.tex. If you system doesn’t have Helvetica yet, you can download it from https://www.fontmirror.com/helvetica for testing purpose. (Don’t forget to update the path to it in the tex file.)

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\documentclass[12pt]{report}
\usepackage[top=2cm,left=0cm,centering,paperheight=5in]{geometry}
\usepackage{fontspec}

\newfontfamily\nimbussanslfont{Nimbus Sans L}
\newfontfamily\freehelvetian{Free Helvetian}
\newfontfamily\nimbussans{Nimbus Sans}
\newfontfamily\helvetica[Path=/home/albert/Downloads/]{Helvetica.ttf}

\newfontfamily\freesansfont{FreeSans}
\newfontfamily\dejavuansfont{DejaVu Sans}

\begin{document}
\begin{LARGE}
\begin{helvetica}
The quick brown fox jumps over the lazy dog Helvetica
\end{helvetica}

\begin{freehelvetian}
The quick brown fox jumps over the lazy dog Free Helvetian
\end{freehelvetian}

\begin{helvetica}
The quick brown fox jumps over the lazy dog Helvetica
\end{helvetica}

\begin{nimbussanslfont}
The quick brown fox jumps over the lazy dog Nimbus Sans L
\end{nimbussanslfont}

\begin{helvetica}
The quick brown fox jumps over the lazy dog Helvetica
\end{helvetica}

\begin{nimbussans}
% The quick brown fox jumps over the lazy \textbf{dog} Nimbus Sans
The quick brown fox jumps over the lazy dog Nimbus Sans
\end{nimbussans}

\begin{helvetica}
The quick brown fox jumps over the lazy dog Helvetica
\end{helvetica}

\begin{freesansfont}
The quick brown fox jumps over the lazy dog Free Sans
\end{freesansfont}

\begin{helvetica}
The quick brown fox jumps over the lazy dog Helvetica
\end{helvetica}

\begin{dejavuansfont}
The quick brown fox jumps over the lazy dog DejaVu Sans
\end{dejavuansfont}
\end{LARGE}
\thispagestyle{empty}
\end{document}