why visibility, visibility hidden none need?????????????

Answer 1

If you want your element dissapear and it'space collapsed use display:none;

But if you want that the place remains vacant use
visibility:hidden;

Answer 2

If you use display none, you remove element from dom. If use visibility, the element placed in dom but not visible

Answer 3

In case when you have a HUGE data in tag, display is more convient way to consteuct web page