They seem to recently position themselves as a Wordpress alternative. There is a blog post about migration from Wordpress to Payload including code: https://payloadcms.com/blog/how-to-migrate-from-wordpress-to...

No, it's a Headless CMS, so no frontend themes and templates. They have an official demo page including a frontend, that you can base your work on: https://github.com/payloadcms/public-demo

If you are looking for a Wordpress-clickety click solution with templates, Payload is not a candidate.