I am making PDF with LaTeX. I have a few sections and subsections. I want to put a link towards the top of the document so that in the PDF someone can click on it and it'll go to that section/subsection. I know it's possible to have this with a linkable table of contents, but I don't want to make a table of contents, I need more control.
Include \usepackage{hyperref} in the preamble of your document. Assign proper labels to your sections and reference these labels using \ref{}. These references will then be turned into clickable links when creating PDFs with pdflatex.