Reducing the white space between slider and footer

Hi ashwin24851. You could try this in your custom css:

#main {
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

Other than that, since your site appears to be running a commercial theme, you should check with the theme vendor for support. Here’s a link to the relevant WP Codex page:
https://codex.wordpress.org/Forum_Welcome#Commercial_Products