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\usepackage{filecontents}

\begin{filecontents}{\jobname.bib}

@article{you2023,
  author =       {You},
  title =        {Overleaf is bad},
  publisher =    {Science},
  year =         2023
}
@article{you2024,
  author =       {You},
  title =        {Overleaf is not what you need at all},
  publisher =    {Science},
  year =         2024
}

\end{filecontents}

\begin{document}

Overleaf is bad~\cite{you2023}.

Overleaf is not what you need at all~\cite{you2024}.

DO NOT use Overleaf~\cite{you2024,you2023}.

\bibliographystyle{plain}
\bibliography{\jobname}

\end{document}

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Overleaf is bad [?].
Overleaf is not what you need at all [?].
DO NOT use Overleaf [?, ?].

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Overleaf is bad [1].
Overleaf is not what you need at all [2].
DO NOT use Overleaf [1, 2].

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\usepackage{filecontents}

\begin{filecontents}{main.bib}

@article{you2023,
  author =       {You},
  title =        {Overleaf is bad},
  publisher =    {Science},
  year =         2023
}
@article{you2024,
  author =       {You},
  title =        {Overleaf is not what you need at all},
  publisher =    {Science},
  year =         2024
}

\end{filecontents}

\begin{document}

Overleaf is bad~\cite{you2023}.

Overleaf is not what you need at all~\cite{you2024}.

DO NOT use Overleaf~\cite{you2024,you2023}.

\bibliographystyle{plain}
\bibliography{main}

\end{document}

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Overleaf is bad [1].
Overleaf is not what you need at all [2].
DO NOT use Overleaf [1, 2].