WordPress : Homepage only working and no links or sub-pages work on the site.

Create .htaccess file and put the below code in it.

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

And save it. All the pages and links will start working on the site