Your app is crashing in PM2, something wasn’t setup right.
Is this running on a windows server? O_o?
While that should work, it certainly isn’t recommended, and it’s not an environment we run regular tests on.
Where are you hosting?
Angular is a frontend framework, just like React/Next and Vue/Nuxt.
Strapi has two parts: React Admin panel (gets built and served) and a Koa.js backend (that services the statically built admin while also holding the code for the APIs and connecting to the database).