You can deploy it to Firebase. Nice and easy.
If you're just interested in deploying the webapp, you can use any service that lets you publish static websites
Netlify has already been mentioned and is a great choice (I actually host a couple apps through Netlify). Here is some documentation on Angular + Netlify integration: [httpsdocs.netlify.com/integrations/frameworks/angularhttpsdocs.netlify.com/integrations/frameworks/angular/)
You can also use [Github Pages](httpspages.github.com/) or [Gitlab Pages](httpsdocs.gitlab.com/ee/user/project/pages/) if you host your repository on one of these services
They key here is that Angular builds your app into aof static files. When you push new code to your repository, Netlify/Github/Gitlab will execute the `build` command to produce these files and deploy them.
