How to
![How-To: Building Collaborative Apps](https://www.pubnub.com/cdn/3prze68gbwl1/7k7dqDZYn6jT8Pudcvjs7g/ea3b2c6bd3250944a0089fb91b12a0ef/Screen_Shot_2022-08-30_at_11.33.57_AM.png?w=360&h=200&fit=)
Collaboration
Build Collaborative Applications
Follow this how-to and learn how you can build and power your real-time collaborative applications with PubNub.
![PubNub Portal How-To: Push Notifications for Android](https://www.pubnub.com/cdn/3prze68gbwl1/5TBAGKZp8xbaXNykvXpPoy/dab6198453019d1ccc2f6d34d382277a/Screen_Shot_2022-07-26_at_1.51.09_PM.png?w=360&h=200&fit=)
Push Notifications
Enabling Mobile Push Notifications: Android
Follow this how-to to enable PubNub's Mobile Push Gateway in the Admin Portal to send your Android users push notifications and alerts.
![how-to virtual events 1200](https://www.pubnub.com/cdn/3prze68gbwl1/IFOhssyArOlw6gExyhfZD/db531510b8cb52a44e884a8542db7446/how-to_virtual_events_1200.png?w=360&h=200&fit=)
Virtual Events
How to Build Chat for Virtual Events
Virtual events need chat to keep users engaged, but it's often a challenge to build a chat solution that works at scale and can handle the network load surges that occur during popular events. As a developer, you need to select a robust backend API provider capable of transmitting and receiving the high volume of messages that your viewers and participants generate.
![How to Build Interactive 2d Chat Games image](https://www.pubnub.com/cdn/3prze68gbwl1/6liRYLnM4ebZyoAPSfKch7/8d42207065740f2c7282de1d366c2f5c/how-to-2d-games.png?w=360&h=200&fit=)
Gaming
How to Build Interactive 2d Chat Games
In this guide, we describe why you’d want to build a 2d game, types of 2d games, and tips for making your 2d games interactive, social, and engaging.
![portal persistence 1200x630](https://www.pubnub.com/cdn/3prze68gbwl1/3YD90NkCPaIFUsp4kWr0Dj/478fd6820c975dd693b3b06610558232/Screen_Shot_2022-07-26_at_1.58.57_PM.png?w=360&h=200&fit=)
PubNub portal
Enabling Persistence
Follow this how-to to enable Persistence in the Admin Portal to persist all messages as they're published.
![How to Create a Real-Time Delivery application How to Create a Real-Time Delivery application](https://www.pubnub.com/cdn/3prze68gbwl1/RNxrnJIn0KOh3pO1CFTWz/0e126b1a4300d0b6dca68d5e9b01ad03/Real-Time-Delivery---Image.png?w=360&h=200&fit=)
Real-Time
How to Create a Real-Time Delivery Application
For any delivery solution, the end user experience will depend on providing real-time updates on vehicle location, delivery time and delivery status
![how-to real-time user counter image](https://www.pubnub.com/cdn/3prze68gbwl1/j6Hf0llsWpOj6BVPctvue/dd9914fcf6f37958cf487c8d22c8b39f/how-to-online-users.png?w=360&h=200&fit=)
Real-Time
How to Build a Real-Time Counter of Active Users
This how-to will explain how to add a real-time counter of active users to any application, what to consider while building this type of feature, and how PubNub can make it easy.
![portal keys 1200x630](https://www.pubnub.com/cdn/3prze68gbwl1/277sONprYeNVYSuzYIQIl/588db45740693bf838bfd57410c83073/Screen_Shot_2022-07-26_at_1.58.46_PM.png?w=360&h=200&fit=)
PubNub portal
Creating Keys
Follow this how-to on creating keys in the Admin Portal to connect your application to the PubNub network.
![portal files 1200x630](https://www.pubnub.com/cdn/3prze68gbwl1/5iVmmebixdKkFUcjz6ZnP9/370b7313bcb82b0ad9131a233b3c5060/Screen_Shot_2022-07-26_at_1.59.21_PM.png?w=360&h=200&fit=)
PubNub portal
Enabling Files
Follow this how-to on enabling Files in the Admin Portal to upload and share files.