How to Upload Laravel Project along with XAMPP database to the Internet?

I've seen a lot of tutorials of deploying laravel app online. I've seen heroku tutorials and followed it but for some matter I can't get the APP_Key fixed (tried key generator, config clear and config cache, etc). And does heroku accept database laravel or just a laravel app like mobile games? I'm a beginner to laravel and there are lots of things I don't know yet. All the tutorial (articles and youtube) helped me progressed but not enough. I'm taking this opportunity to ask laravel users on how they deploy laravel project along with xampp database onto web server. I'm sorry in advance if I don't understand your answer immediately.