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.

Scrimba
Skills you'll gain: UI Components, React.js, Javascript, JavaScript Frameworks
Intermediate · Course · 1 - 4 Weeks

Johns Hopkins University
Skills you'll gain: Ggplot2, Plot (Graphics), Data Visualization, Statistical Visualization, Data Visualization Software, Exploratory Data Analysis, Data Presentation, R (Software), Tidyverse (R Package), R Programming, Graphing, Data Wrangling, Data Manipulation
Mixed · Course · 1 - 3 Months

LearnQuest
Skills you'll gain: Blockchain, Cryptography, Data Storage, Systems Architecture, Network Architecture, FinTech, Distributed Computing, Cryptographic Protocols, Programming Principles, Emerging Technologies, Computing Platforms, Scalability, Data Integrity
Intermediate · Course · 1 - 3 Months

Skills you'll gain: TypeScript, Code Reusability, React.js, Javascript, Software Design Patterns
Advanced · Guided Project · Less Than 2 Hours

Skills you'll gain: Node.JS, JavaScript Frameworks, Web Frameworks, Authentications, MongoDB, Postman API Platform, Restful API, Server Side, Middleware, JSON, Application Programming Interface (API), Web Development Tools, Web Applications, Javascript, Back-End Web Development, API Testing, NoSQL
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Kubernetes, Cloud-Native Computing, YAML, Containerization, Devops Tools, Application Deployment, Command-Line Interface, Cloud Deployment, Software Installation, Development Environment, Infrastructure Architecture, Automation, Configuration Management, Application Lifecycle Management, Scalability
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Ggplot2, Model Evaluation, Plot (Graphics), Regression Analysis, Predictive Analytics, Predictive Modeling, Statistical Visualization, Data-Driven Decision-Making, Statistical Modeling, R Programming, Descriptive Statistics, R (Software), Exploratory Data Analysis, Descriptive Analytics, Statistical Analysis, Data Analysis
Intermediate · Guided Project · Less Than 2 Hours

Skills you'll gain: Back-End Web Development, PostgreSQL, Database Development, Python Programming, Restful API, SQL, API Design, Object-Relational Mapping, Application Programming Interface (API), Database Management, Databases, Data Validation, Development Environment
Intermediate · Course · 1 - 3 Months

Skills you'll gain: GitHub, Version Control, Git (Version Control System), Unix Shell, Software Versioning, Linux Commands, Command-Line Interface, Collaborative Software, Software Configuration Management, Software Installation, Configuration Management, File Systems, File Management, System Configuration
Beginner · Course · 1 - 3 Months

Coursera
Skills you'll gain: Data Manipulation, Tidyverse (R Package), Data Wrangling, Data Analysis, R Programming, R (Software), Data Transformation, Statistical Analysis
Beginner · Guided Project · Less Than 2 Hours

Skills you'll gain: Purchasing, Supplier Relationship Management, Contract Management, Supplier Management, Procurement, Vendor Relationship Management, Supply Management, Supplier Performance Management, Vendor Management, Contract Compliance, Strategic Sourcing, Vendor Contracts, Price Negotiation, Supply Chain, Negotiation, Contract Negotiation, Business Ethics, Compliance Management, Supply Chain Management, Ethical Standards And Conduct
Beginner · Course · 1 - 4 Weeks

Johns Hopkins University
Skills you'll gain: Intrusion Detection and Prevention, Threat Detection, Distributed Denial-Of-Service (DDoS) Attacks, Threat Management, Anomaly Detection, Continuous Monitoring, System Monitoring, Virtual Machines, Network Security, Virtualization and Virtual Machines, Event Monitoring, Network Monitoring, Network Analysis
Intermediate · Course · 1 - 3 Months