I am using vim-latex-suite and do not get how to jump to the <++>
in expanded macros.
For example, when typing SSE in insert mode, I get:
/section{}<++>
What is the exact meaning of <++>
and how do I move there?
You have to press CtrlJ.
That's a cursor placeholder, specific to the LaTeX suite. Sometimes there will be some text included. This page explains more on the suite included macros.