The way I got into using more advanced stuff was https://archive.org/details/viimprovedvim0000oual But other good things are https://play.google.com/store/apps/details?id=develop.example.beta1139.vimmaster and just reading the docs.

Stack overflow has people ask how do I X with vim, and pretty consistently you’ll discover some new way to do things.

Basically, if you find yourself doing something often, expect that someone else did in the post and made a better way in vim.

Here is a good one to start with. https://medium.com/usevim/vim-101-virtual-editing-661c99c05847