What's preconfigured out of the box
After a one click automation Strapi deployment, the Node.js runtime and the database (PostgreSQL or MySQL, depending on the template) are already linked and running — you don't configure the connection string manually. The admin panel and the API run on the same Node.js process by default, listening on Strapi's standard port 1337 unless the template routes it behind a reverse proxy.
First login
Strapi doesn't ship with a default admin password — the first time you open the admin panel at /admin, it shows a registration form where you create the first administrator account yourself, with your own email and password.
Until that first account is created, the admin panel is open to whoever reaches it first — creating the account immediately after deployment closes that window.
Practical first steps
Environment variables — APP_KEYS, API_TOKEN_SALT, database credentials — are what Strapi uses to sign sessions and connect to the database. Once logged in, the first practical task is usually creating your first content type through the Content-Type Builder — everything else, including the REST and GraphQL endpoints, gets generated from that.