In Vim, what is the best way to select, delete, or comment out large portions of multi-screen text?

Question

Selecting a large amount of text that extends over many screens in an IDE like Eclipse is fairly easy since you can use the mouse, but what is the best way to e.g. select and de

Answer 1

marks would be the simplest mb where u want to begin and me where u want to end once this is done you can do pretty much anything you want

:'b,'ed

deletes from marker b to marker e

commenting out 40 lines you can do in the visual mode

V40j:s/^/#/

will comment out 40 lines from where u start the sequence