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Heroku Architecture
- Compute (Dynos)
  - Dyno Management
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Command Line

Deployment
- Deploying with Git
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Continuous Delivery & Integration
- Continuous Integration

Language Support
- Node.js
  - Troubleshooting Node.js Apps
  - Working with Node.js
  - Node.js Behavior in Heroku
- Ruby
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  - Working with Ruby
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  - Troubleshooting Ruby Apps
- Python
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  - Background Jobs in Python
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  - Working with Django
- Java
  - Java Behavior in Heroku
  - Working with Java
  - Working with Maven
  - Working with Spring Boot
  - Troubleshooting Java Apps
- PHP
  - PHP Behavior in Heroku
  - Working with PHP
- Go
  - Go Dependency Management
- Scala
- Clojure
- .NET

Databases & Data Management
- Heroku Postgres
  - Postgres Basics
  - Postgres Getting Started
  - Postgres Performance
  - Postgres Data Transfer & Preservation
  - Postgres Availability
  - Postgres Special Topics
- Heroku Key-Value Store
- Apache Kafka on Heroku
- Other Data Stores

Monitoring & Metrics
- Logging

App Performance

Add-ons
- All Add-ons

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Security
- App Security
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  - Single Sign-on (SSO)
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  - Infrastructure Networking
- Compliance

Heroku Enterprise
- Enterprise Accounts
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- Heroku Connect (Salesforce sync)
  - Heroku Connect Administration
  - Heroku Connect Reference
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Patterns & Best Practices

Extending Heroku
- Platform API
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  - Add-on Development Tasks
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- Building CLI Plugins
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- Dev Center

Accounts & Billing

Troubleshooting & Support

Integrating with Salesforce

Default Ruby version for new apps is now 3.1.4

Change effective on 12 May 2023

The default Ruby version for new Ruby applications is 3.1.4. You’ll only get the default if the application does not specify a ruby version.

Ruby version 3.3.0-preview1 is now available PostgreSQL extension upgrades enabled for all Heroku Postgres plans