Core Java courses can help you learn object-oriented programming, exception handling, multithreading, and Java Collections. You can build skills in writing efficient algorithms, debugging code, and developing user interfaces. Many courses introduce tools like Eclipse and IntelliJ IDEA, which are commonly used for coding and testing Java applications, along with frameworks such as Spring and Hibernate that facilitate web development and database management.

Coursera
Skills you'll gain: Hypertext Markup Language (HTML), Web Content Accessibility Guidelines, Semantic Web, Web Content, Information Architecture, Web Design and Development, Web Development, Front-End Web Development
Beginner · Guided Project · Less Than 2 Hours

Skills you'll gain: JSON, Javascript, Ajax, Web Development Tools, Unit Testing, Development Testing, Event-Driven Programming, Hypertext Markup Language (HTML), Data Validation, Data Structures, Performance Tuning, Network Protocols
Beginner · Course · 1 - 3 Months

Board Infinity
Skills you'll gain: Middleware, Node.JS, Development Environment, Application Development, JavaScript Frameworks, TypeScript, Web Applications, Web Development Tools, Application Programming Interface (API), Server Side, Javascript, Android Development, Dependency Analysis
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Docker (Software), Containerization, Application Deployment, Command-Line Interface, Development Environment, Nginx, Software Installation, Node.JS, Virtual Machines, React.js
Beginner · Course · 1 - 3 Months

Skills you'll gain: Transaction Processing, Hybrid Cloud Computing, COBOL (Programming Language), Mainframe Technologies, Mainframe Computing, IBM Cloud, Cloud Applications, Enterprise Application Management, Application Servers, Application Development, Application Programming Interface (API)
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Operations Research, Supply Chain, Supply Chain Management, Supply Chain Planning, Transportation, Supply Chain, and Logistics, Process Optimization, Capacity Planning, Production Planning, Data Analysis, R Programming
Beginner · Guided Project · Less Than 2 Hours

Skillshare
Skills you'll gain: Storyboarding, Animations, Storytelling, Motion Graphics, Multimedia, Musical Composition, Adobe After Effects, Video Production, Photo/Video Production and Technology, Computer Graphics, Video Editing, Apple software proficiency, Timelines, Writing, Color Theory, Design
Beginner · Specialization · 1 - 3 Months

Scrimba
Skills you'll gain: Javascript, Event-Driven Programming, Web Development Tools, Application Programming Interface (API)
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Supply Chain, Logistics, Supply Chain Management, Supply Chain Planning, Performance Measurement, Transportation Management, Operational Efficiency, Operations Management, Business Operations, Corporate Sustainability, Customer Relationship Management, Procurement, Warehouse Management, Supplier Relationship Management, Enterprise Risk Management (ERM)
Mixed · Course · 1 - 3 Months

Skills you'll gain: Selenium (Software), Test Automation, Object Oriented Programming (OOP), Software Testing, Browser Compatibility, Software Installation, Automation, Scripting, Python Programming, File Management, Development Environment, Debugging
Beginner · Course · 1 - 3 Months

Johns Hopkins University
Skills you'll gain: Version Control, GitHub, Git (Version Control System), Data Transformation, Data Science, Data Analysis, R (Software), Data Processing, R Programming, Rmarkdown, Software Installation, Command-Line Interface
Mixed · Course · 1 - 4 Weeks

LearnQuest
Skills you'll gain: Cloud Computing, Cloud Services, Cloud Computing Architecture, Cloud Infrastructure, Cloud Solutions, Scalability, Cloud Platforms, Public Cloud, Software As A Service, Infrastructure As A Service (IaaS), Cloud Storage, Platform As A Service (PaaS), Private Cloud, Hybrid Cloud Computing, Virtualization
Mixed · Course · 1 - 4 Weeks