After you create a Countly Analytics One-Click Droplet, head over to the IP address of your Droplet in your favorite browser and create your Countly global administrator account via the setup screen. Afterwards you will be asked to create your first application and then you will be ready to collect analytics data from your applications.

Countly offers various SDKs to collect data from mobile, web and desktop applications. Follow the integration guide for your SDK of choice and learn more about the inner workings.

You can further configure your Countly Community Edition to use HTTPs and MongoDB authentication via the following guides;

Configuring HTTPs and SSL
Installing Let's Encrypt for HTTPs
Securing MongoDBFurther reading & resources;
Countly Homepage
Countly Community Edition GitHub Repository
Getting Started
API Reference
Database Schema
Plugin Development Guide