diff --git a/README.md b/README.md
index cd2aa74..3aea5c8 100644
--- a/README.md
+++ b/README.md
@@ -128,3 +128,9 @@ Feel free to take a look. You might learn new things. They have been designed to
## 🙌🏼 How to Contribute?
You are more than welcome to contribute and build your own cheat sheet for your favorite programming language, framework or development tool. Just submit changes via pull request and I will review them before merging.
+
+## 👩💻👨💻 Our valuable Contributors
+
+
+ 
+
diff --git a/backend/django.py b/backend/django.py
index 38b920d..50f53bd 100644
--- a/backend/django.py
+++ b/backend/django.py
@@ -37,6 +37,15 @@
# Use underscores in URL pattern names rather than dashes.
+# *****************************************************************************
+# CODING STYLE > DATABASE
+# *****************************************************************************
+
+# 1.Register your app in admin file in your app folder to use admin panel in django
+# 2.Create a superuser using command python manage.py createsuperuser
+# 3.Remember to migrate after you change anything in your models.py file
+# 4.Use /admin/ page to add data in your tables for testing purpose
+
# *****************************************************************************
# Deployment
diff --git a/databases/mongodb.sh b/databases/mongodb.sh
new file mode 100644
index 0000000..e8da009
--- /dev/null
+++ b/databases/mongodb.sh
@@ -0,0 +1,225 @@
+# *****************************************************************************
+# BASICS
+# *****************************************************************************
+
+# Connect MongoDB Shell
+mongo # connects to mongodb://127.0.0.1:27017 by default
+mongo --host --port -u -p # omit the password if you want a prompt
+
+# Show All Databases
+show dbs
+
+
+# Show Current Database
+db
+
+
+# Create Or Switch Database
+use
+
+
+# Drop Database
+db.dropDatabase()
+
+
+# Create Collection
+db.createCollection('posts')
+
+
+# Show Collections
+show collections
+
+
+# *****************************************************************************
+# CRUD
+# *****************************************************************************
+
+# Insert Row
+db.posts.insert({
+ title: 'Post One',
+ body: 'Body of post one',
+ category: 'News',
+ tags: ['news', 'events'],
+ user: {
+ name: 'John Doe',
+ status: 'author'
+ },
+ date: Date()
+})
+
+
+# Insert Multiple Rows
+db.posts.insertMany([
+ {
+ title: 'Post Two',
+ body: 'Body of post two',
+ category: 'Technology',
+ date: Date()
+ },
+ {
+ title: 'Post Three',
+ body: 'Body of post three',
+ category: 'News',
+ date: Date()
+ },
+ {
+ title: 'Post Four',
+ body: 'Body of post three',
+ category: 'Entertainment',
+ date: Date()
+ }
+])
+
+
+# Get All Rows
+db.posts.find()
+
+
+# Get All Rows Formatted
+db.posts.find().pretty()
+
+
+# Find One Row
+db.posts.findOne({ category: 'News' })
+
+
+# Find Rows
+db.posts.find({ category: 'News' })
+
+
+# Find Specific Fields
+db.posts.find({ title: 'Post One' }, {
+ title: 1,
+ author: 1
+})
+
+
+# Update Row
+db.posts.update({ title: 'Post Two' },
+{
+ title: 'Post Two',
+ body: 'New body for post 2',
+ date: Date()
+},
+{
+ upsert: true
+})
+
+
+# Update Specific Field
+db.posts.update({ title: 'Post Two' },
+{
+ $set: {
+ body: 'Body for post 2',
+ category: 'Technology'
+ }
+})
+
+
+# Delete Row
+db.posts.remove({ title: 'Post Four' })
+
+
+# *****************************************************************************
+# OTHER FUNCTIONS
+# *****************************************************************************
+
+# Sort Rows
+db.posts.find().sort({ title: 1 }).pretty() # asc
+db.posts.find().sort({ title: -1 }).pretty() # desc
+
+
+# Count Rows
+db.posts.find().count()
+db.posts.find({ category: 'news' }).count()
+
+
+# Limit Rows
+db.posts.find().limit(2).pretty()
+
+
+# Chaining
+db.posts.find().limit(2).sort({ title: 1 }).pretty()
+
+
+# Foreach
+db.posts.find().forEach(function(doc) {
+ print("Blog Post: " + doc.title)
+})
+
+
+# Increment Field (\$inc)
+db.posts.update({ title: 'Post Two' },
+{
+ $inc: {
+ likes: 5
+ }
+})
+
+
+# Rename Field
+db.posts.update({ title: 'Post Two' },
+{
+ $rename: {
+ likes: 'views'
+ }
+})
+
+
+# Sub-Documents
+db.posts.update({ title: 'Post One' },
+{
+ $set: {
+ comments: [
+ {
+ body: 'Comment One',
+ user: 'Mary Williams',
+ date: Date()
+ },
+ {
+ body: 'Comment Two',
+ user: 'Harry White',
+ date: Date()
+ }
+ ]
+ }
+})
+
+
+# Find By Element in Array (\$elemMatch)
+db.posts.find({
+ comments: {
+ $elemMatch: {
+ user: 'Mary Williams'
+ }
+ }
+ }
+)
+
+
+# Add Index
+db.posts.createIndex({ title: 1 })
+
+
+# Drop Index
+db.posts.dropIndex("title_1")
+
+
+# Hide/Unhide Indexes
+db.posts.hideIndex("title_1")
+db.posts.unhideIndex("title_1")
+
+
+# Text Search
+db.posts.find({
+ $text: {
+ $search: "\"Post O\""
+ }
+})
+
+
+# Greater & Less Than
+db.posts.find({ views: { $gt: 2 } })
+db.posts.find({ views: { $gte: 7 } })
+db.posts.find({ views: { $lt: 7 } })
+db.posts.find({ views: { $lte: 7 } })
diff --git a/frontend/html5.html b/frontend/html5.html
index 3d4910e..06bc17a 100644
--- a/frontend/html5.html
+++ b/frontend/html5.html
@@ -39,7 +39,7 @@
and
and
-