Here is my minimalistic vimrc I feel comfortable with. I use it mostly with c++ and ctags. Hope you'll find it useful too.

To start using it: mkdir ~/.vim/swapfiles/ cd your_project_root/ ctags -R . -f ctags_tag

Open files with vim from project root directory or some subdirectory, then just use "ctrl + ]" to open a symbol definition in the same window, or "ctrl + " to open it in a new window.