How can I reduce the margin between the first line of my document and the headerline?
\documentclass[12pt, a4paper]{article}
\usepackage[
top=0.6in,bottom=0.6in,left=0.7in,right=0.5in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[misc]{ifsym}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{mathtools}
\usepackage{amssymb}
\usepackage{forest}
\usepackage[parfill]{parskip}
\renewcommand{\baselinestretch}{1}
\usepackage{tikz}
\usepackage{tkz-euclide}
\usetkzobj{all}
\usetikzlibrary{intersections}
\makeatother
\usepackage{fancyhdr}
\pagestyle{fancy}
\usepackage{lastpage}
\lhead{LH}
\rhead{RH}
\chead{CH}
\rfoot{Page \thepage \hspace{1pt} of \pageref{LastPage}}
\lfoot{LF}
\cfoot{CF}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\begin{document}
\large
First Line of my document.........
\end{document}
\headsep=0pt. For these kind of issues use\usepackage{layout}and then\layoutimmediately after\begin{document}. See for instance Remove vertical space at start of latex document and Displaying page construction guides. – Peter Grill Apr 25 '19 at 07:00