Where and how do I actually use <div> in html? If I use two tables, how to identify the second table using css?

Question

In my program, while making changes to first table the other table also gets the similar changes at the same time.

Answer 1

Use container with
<div class=""></div> or
<div id=""></div> or
<section class=""></section> or
<Section id=""></section> and make the changes in CSS

Answer 2

If you want to make different design of each table, you can use div tag with different class or id!!