diff --git a/.env_file b/.env_file
new file mode 100644
index 0000000..05a38c3
--- /dev/null
+++ b/.env_file
@@ -0,0 +1,7 @@
+SECRET_KEY=
+DEBUG=
+
+EMAIL_BACKEND=
+
+EMAIL_HOST_USER=
+EMAIL_HOST_PASSWORD=
\ No newline at end of file
diff --git a/Developer_Guide.md b/Developer_Guide.md
index 42f7451..4aa35f7 100644
--- a/Developer_Guide.md
+++ b/Developer_Guide.md
@@ -24,6 +24,6 @@ python .\manage.py migrate --fake
 python .\manage.py runserver
 </pre>
 
-# Install
+# [Install this pip packages](./requirements.txt)
 
--   [Install this pip packages](./requirements.txt)
+# [make .env file with key and value](./.env_file)
diff --git a/OneLink/settings.py b/OneLink/settings.py
index a5d2e74..15a9d70 100644
--- a/OneLink/settings.py
+++ b/OneLink/settings.py
@@ -10,7 +10,7 @@
 https://docs.djangoproject.com/en/3.1/ref/settings/
 """
 
-# import secret_details
+from decouple import config
 from django.contrib.messages import constants as messages
 from pathlib import Path
 import os
@@ -24,11 +24,10 @@
 # See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/
 
 # SECURITY WARNING: keep the secret key used in production secret!
-SECRET_KEY = os.environ.get('ONELINK_SECRET_KEY')
+SECRET_KEY = config('SECRET_KEY')
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = (os.environ.get('ONELINK_DEBUG_VALUE') == 'True')
-DEBUG = True
+DEBUG = config('DEBUG', cast=bool)
 
 
 ALLOWED_HOSTS = [
@@ -180,17 +179,17 @@
 }
 
 
-# password reset using console ( Testing purpose )
-EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
+# testing:- django.core.mail.backends.console.EmailBackend
+# or
+# production:- django.core.mail.backends.smtp.EmailBackend
 
-
-# # password reset using gmail account
-# EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
-# EMAIL_HOST = 'smtp.gmail.com'
-# EMAIL_PORT = 587
-# EMAIL_USE_TLS = True
-# EMAIL_HOST_USER = os.environ.get()
-# EMAIL_HOST_PASSWORD = os.environ.get()
+# password reset using gmail account
+EMAIL_BACKEND = config('EMAIL_BACKEND')
+EMAIL_HOST = 'smtp.gmail.com'
+EMAIL_PORT = 587
+EMAIL_USE_TLS = True
+EMAIL_HOST_USER = config('EMAIL_HOST_USER')
+EMAIL_HOST_PASSWORD = config('EMAIL_HOST_PASSWORD')
 
 # django-extensions ... graph_models
 GRAPH_MODELS = {
diff --git a/requirements.txt b/requirements.txt
index dcb40d8..83ef96e 100644
Binary files a/requirements.txt and b/requirements.txt differ
diff --git a/venv_config_vars.md b/venv_config_vars.md
deleted file mode 100644
index 414e2b2..0000000
--- a/venv_config_vars.md
+++ /dev/null
@@ -1,8 +0,0 @@
-# Virtual Environment
-
-### Set this variable In you Computer
-
-```
-ONELINK_SECRET_KEY = "SECRET_KEY of project"
-ONELINK_DEBUG_VALUE = "DEBUG True or False"
-```