Linking the Table of Contents in LaTeX

You can add a phantomsection to provide a target for the link to the bibliography. Make sure to use it (and your addcontentsline) on the same page as the bibliography and not the previous page like in your example. You can ensure this by adding clearpage before them.

   documentclass[12pt]{report}
    usepackage{amsfonts}
    usepackage{graphicx}
%    usepackage{pstcol}
    usepackage{float}
    usepackage{amsmath}
    usepackage{color}
    usepackage[colorlinks = true,
               linkcolor = black,
               urlcolor  = black,
               citecolor = blue,
               anchorcolor = blue]{hyperref}
    usepackage{cancel}
    usepackage{polynom}
    usepackage{amsthm}
    usepackage{multicol}
    usepackage{amssymb}
    usepackage{comment}
    
    
    newtheorem{thm}{Theorem}[chapter]
    newtheorem{lem}{Lemma}[chapter]
    newtheorem{exa}{Example}[chapter]
    newtheorem{cor}{Corollary}[chapter]
    newtheorem{note}{Note}[chapter]
    
    
    begin{document}

tableofcontents

chapter{Introduction}

section{Basics}
    
    
    cleardoublepage
    phantomsection
    addcontentsline{toc}{chapter}{Bibliography}
    
    
    begin{thebibliography}{99}
    
    bibitem{} ....
    
    end{thebibliography}
    
    end{document}