[JupiterMoon]

Some thoughts:

What you call tabs are what vim calls buffers. (EDIT vim has something called tabs as well but they do something else.)

Completion press e.g. control-x (although I actually use a plugin here so I don't know how good vim's built in is).

Visual selection add set mouse=a to the .vimrc

Or using the "v" command

[base698]

What he calls tabs are actually tabs: :tabe create tab :tabn next tab, :tabp previous tab, :tabm move tab.

I have tabn/tabp bound to <leader>l and <leader>h for easy nav and <leader>t for create.

[ecnahc515]

Tabs in vim are actually just views of buffers. Ie: a workspace more than an editing window.

Buffers are the proper solution to the mentioned comment.