You are using a babel language that gives " a special shorthand meaning which is confusing \input. It is simplest not to use spaces in file names then you can just remove "
\input{"Bibliography.tex"}
should be simply
\input{Bibliography}
If you must use spaces in file names for some reason then you can probably do
\input{\string"Argument of Expert Opinion.tex\string"}
Here is a complete example of the input/include command at work:
The example consists of 3 files in a folder structure as follows:
[Parent Folder]
|
+-- file1.tex
|
+-- fig.jpg
|
+-- [folder]
|
+-file2.tex
fig.jpg is just an ordinary jpg image file. The contents of file1.tex are as follows:
\documentclass{article}
\usepackage{graphicx}
\begin{document}
\input{folder/file2.tex}
\end{document}
Note the inclusion of the (relative) path as well as the filename of file2.tex.
The contents of file2.tex are
\includegraphics{fig.jpg}
Note that file2.tex does not have its own preamble, document class, \begin{document} etc.
Think of \input as having a similar effect to you manually copying and pasting whatever is in file2.tex into file1.tex: no need to include anything you wouldn't want to copy in this fashion. Following through this copying/pasting logic: note also that the path to fig.jpg needs to be relative to file1.tex, not file2.tex. Since fig.jpg is in the same folder as file1.tex this means that we don't have to specify any path.
Saving this file/folder structure and compiling file1.tex results in a document with fig.jpg included in it.
Best Answer
\input{filename}imports the commands fromfilename.texinto the target file; it's equivalent to typing all the commands fromfilename.texright into the current file where the\inputline is.\include{filename}essentially does a\clearpagebefore and after\input{filename}, together with some magic to switch to another.auxfile, and omits the inclusion at all if you have an\includeonlywithout the filename in the argument. This is primarily useful when you have a big project on a slow computer; changing one of the include targets won't force you to regenerate the outputs of all the rest.\include{filename}gets you the speed bonus, but it also can't be nested, can't appear in the preamble, and forces page breaks around the included text.