How can i change the list of tables heading font

Question

I have to make all the headings with 12 pt.s bold. How can i change predefined headings like list of tables generated with command \listoftables ?

(and content page of course)

Here is all packages i'm using.

\documentclass[12pt,a4paper]{article}

\usepackage[utf8]{inputenc}
\usepackage{titlesec}
\usepackage[turkish]{babel}

\usepackage[T1]{fontenc}

\usepackage{pslatex}

\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}

\titleformat*{\subsection}{\normalsize\bfseries}
\titleformat*{\subsubsection}{\normalsize\bfseries\itshape}

\titleformat{\section}
{\normalfont\fontsize{12}{14.4}\bfseries\MakeUppercase}{\thesection}{1em}{}
\usepackage[overload]{textcase} 
\usepackage[left=3.50cm, right=2.50cm, top=3.00cm, bottom=3.00cm,nohead,nofoot]{geometry}

Answer 1

You can use the titlesec package to customize the sectional unit titles. Since \listoffigures produces the title using \section*, the change in formatting for \section will affect this list (and every other element which internally uses \section or its starred variant). Since the 12pt class option is being used, it is enough to use \normalsize; the explicit option was used to be able to handle the case change in the titles. I also incorporated to my answer the settings for \subsection and \subsubsection that you included in your edited question:

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[turkish]{babel}
\usepackage[left=3.50cm, right=2.50cm, top=3.00cm, bottom=3.00cm,nohead,nofoot]{geometry}
\usepackage[overload]{textcase} 
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[explicit]{titlesec}

\titleformat{\section}
  {\normalfont\normalsize\bfseries}{\thesection}{1em}{\MakeTextUppercase{#1}}
\titleformat{\subsection}
  {\normalfont\normalsize\bfseries}{\thesubsection}{1em}{#1}
\titleformat{\subsubsection}
  {\normalfont\normalsize\bfseries\itshape}{\thesubsubsection}{1em}{#1}

\begin{document}

\listoffigures
\section{Test}

\end{document}