Vim: Don't move around the document in insert mode!
New Vim users will want the following lines to teach them to do things right:
[sourcecode language="bash"]
inoremap <Up> <NOP>
inoremap <Down> <NOP>
inoremap <Left> <NOP>
inoremap <Right> <NOP>
noremap <Up> <NOP>
noremap <Down> <NOP>
noremap <Left> <NOP>
noremap <Right> <NOP>
[/sourcecode]
This will disable the arrow keys while you’re in normal mode to help you learn to use hjkl. Trust me, you want to learn to use hjkl.