This is a start.
\documentclass[tikz,border=3mm]{standalone}
\usetikzlibrary{arrows.meta,bending}
\begin{document}
\begin{tikzpicture}[declare function={F(\x,\a,\b,\c)=\a*exp(-(\x-\b)*(\x-\b)/\c);
f(\x)=5-F(\x,4.5,2.8,6);},bullet/.style={circle,fill=black,inner sep=1pt},
font=\sffamily]
\draw[stealth-stealth] (0,6) node[below left]{$f(x)$} |- (6,0) node[below left]{$x$};
\draw plot[smooth,domain=0:5] (\x,{f(\x)});
\foreach \X [count=\Y]
in {0.2,0.5,0.9,1.2,1.8,2,2.2,2.6,2.8}
{\draw (\X,-0.2) -- (\X,0.2);
\ifnum\Y=1
\path (\X,{f(\X)}) node[bullet] (b\Y){};
\else
\draw[very thin,gray,-{Latex[bend,length=2pt,width=2pt]}] (b\the\numexpr\Y-1)
to[bend left] (\X,{f(\X)}) node[bullet] (b\Y){};
\fi};
\draw[stealth-] (b1) -- ++ (60:1) node[above]{Start};
\foreach \Y in {2,3}
{\path (b\Y) to[bend left] node[above right]{Iteration \Y} (b\the\numexpr\Y+1);}
\end{tikzpicture}
\end{document}

\documentclass
and ending with\end{document}
). Whoever wants to help you, can copy your code and extend it. Just click on theedit
button left below your question, paste your code, and format it as code (mark the code lines and click on the '{}' button of the edit windows).