My Theme’s CSS is not showing

I created my own theme and installed it onto wordpress, I added codes to the stylesheet, header, footer and index.
https://persiantravelandtours.com/
As you can see the CSS is not in effect.
I guess my question how do I link my stylesheet to my index.php

Also, where do I add the script tags such as jquary and the images?

• This topic was modified 7 years, 5 months ago by arashabtahi.
• This topic was modified 7 years, 5 months ago by arashabtahi.

The page I need help with: [log in to see the link]