In fact the "simpler version" on Ubuntu is also a Vim. Vim can be compiled with more or less features. The "simple" Vim is still available as
vi.tiny (at least on Ubuntu 16.04).
I would recommend to just use the full-featured Vim (called "Huge version"). It has things like syntax highlighting and a lot more.
BTW: If you want to use Vim with graphical UI, you can install it with
sudo apt-get install vim-gtk3
How to start?
Well, Vim (and even the smaller Vim) is a very powerful editor. And like every powerful software there is a lot to learn. At the beginning it will be hard and you will be slow, but that will improve.
For the first steps start the program
vimtutor. It loads a text file as a tutorial and teaches you the basic move and editing commands.
Also the help of Vim is very good and extensive. You could start with
And you are always welcome to ask questions here. Be prepared that a lot of answers will contain a reference to some help topic. Don't worry, we all know that finding the correct help topics is sometimes difficult for a beginners.
One last tip: Vim is highly configurable using a file called
vimrc. Don't just copy some fancy configuration from somewhere. You may use them as inspiration, but you should build up your own configuration as you learn.