It could be just me, but it is difficult for me to sometimes tell the indentation level of multiple indented lines. So here is a tip for someone like me:
IndentLine is an excellent vim plugin that does it for you. For installation, simply use Vundle; insert the following line in your .vimrc
If you are not too familiar with Vundle, refer to this post where I explained how to use Vundle to install a different plugin.