When I use Neovim, I need to (know I can) understand it completely to make myself comfortable.
I switched from Vim so I searched for the help manual. Just like Vim, I get the user manual and reference manual. So I know I can understand Neovim-as-Vim very well.
But how can I understand Neovim-as-Neo? I need to know what Neovim changed from Vim and why it did and how. Then I think I can understand Neovim very well. After that I can modify it for myself and I can feel comfortable.
How can I do that and where can I start?