how to make class on admin panel stactinline and modeladmine in django code example

Example 1: django admin register mdoel

from django.contrib import admin
from myproject.myapp.models import Author

admin.site.register(Author)

Example 2: django admin register

from django.contrib import admin
from .models import Author

@admin.register(Author)
class AuthorAdmin(admin.ModelAdmin):
    pass