field_name=RichTextField()

pip install django-ckeditor

# Application definition
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'ckeditor',
    'geeks',
]

from django.db import models
from django.db.models import Model
from ckeditor.fields import RichTextField
 
 
# Create your models here.
class GeeksModel(Model):
    geeks_field = RichTextField()

python manage.py makemigrations

# Generated by Django 3.2.3 on 2021-05-13 09:40
 
import ckeditor.fields
from django.db import migrations, models
 
 
class Migration(migrations.Migration):
 
    initial = True
 
    dependencies = [
    ]
 
    operations = [
        migrations.CreateModel(
            name='GeeksModel',
            fields=[
                ('id', models.BigAutoField(
                  auto_created=True, primary_key=True,
                  serialize=False, verbose_name='ID')),
               
                ('geeks_field', ckeditor.fields.RichTextField()),
            ],
        ),
    ]

python manage.py migrate

from django.contrib import admin
from .models import GeeksModel
 
 
# Register your models here.
admin.site.register(GeeksModel)