Hello @onlyamd4000,
After activation of the theme by default, you will see the list of posts on home page. You can change homepage into the structure as shown in Demo Page and for that, you need to setup static front page.
To set a static front page you need to have a page which can be set as the static front page. If you have the pages available just go to Admin Panel > Appearance > Customize > Homepage Settings and choose option A static Page under the option Your homepage displays. Then assign the pages for Homepage and Post Page .
Please refer to below screenshot for any confusion.
https://image.prntscr.com/image/UumXLr5wQt_CnqsQgJrjcA.png
Hope this helps.
Best Regards!!