This is pdfTeX, Version 3.14159265-2.6-1.40.20 (MiKTeX 2.9.7140 64-bit) (preloaded format=pdflatex 2019.9.16)  2 OCT 2019 16:25
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**./01-introduction.tex
(01-introduction.tex
LaTeX2e <2018-12-01>
! Undefined control sequence.
l.1 \section
            {Introduction}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1 \section{I
              ntroduction}
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

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)
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<*> ./01-introduction.tex
                         
*** (job aborted, no legal \end found)

 
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!  ==> Fatal error occurred, no output PDF file produced!