What code does WP use for baseurl?

I’m trying to integrate WordPress into my site. My site has something like this in a config.php:
$baseurl = 'https://myawesomesite.com';

WordPress probably has something similar. What is it?

I need it for the template files in WordPress. I can’t get $baseurl to work everywhere. It gets messy. I should probably just use WordPress native “baseurl” and ideally define it somewhere as “wpbaseurl = baseurl/blog”.