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: Node.JS, JSON, Server Side, Web Development Tools, Back-End Web Development, JavaScript Frameworks, Web Servers, Application Programming Interface (API), Restful API, Javascript, Web Development, Package and Software Management, Routing Protocols, Software Design Patterns, Maintainability, Servers
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Node.JS, JavaScript Frameworks, Authentications, MongoDB, Postman API Platform, Restful API, Middleware, JSON, Web Applications, Javascript, Back-End Web Development
Intermediate · Course · 1 - 3 Months

Skills you'll gain: PySpark, Apache Hadoop, Apache Spark, Big Data, Apache Hive, Analytics, Data Processing, Data Mapping, Text Mining, Distributed Computing, Java, Debugging, Java Programming
Intermediate · Course · 1 - 4 Weeks

Ball State University
Skills you'll gain: Data Visualization, Rmarkdown, Exploratory Data Analysis, Data Visualization Software, Ggplot2, Interactive Data Visualization, Plot (Graphics), Statistical Visualization, R (Software), R Programming, Data Storytelling, Data Presentation, Histogram, Scatter Plots, Data Analysis
Build toward a degree
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Classification And Regression Tree (CART), Decision Tree Learning, Predictive Modeling, Data Processing, Statistical Modeling, R Programming, Supervised Learning, Machine Learning Algorithms, Machine Learning
Beginner · Guided Project · Less Than 2 Hours

Skills you'll gain: Data Centers, Ansible, Open Shortest Path First (OSPF), Network Switches, Virtual Local Area Network (VLAN), Network Infrastructure, Border Gateway Protocol, Network Architecture, Network Administration, Network Routing, Infrastructure Security, Network Security, Virtualization, Network Monitoring, Data Storage Technologies, Automation
Intermediate · Course · 1 - 3 Months

University of California, Irvine
Skills you'll gain: Telecommuting, Virtual Teams, Collaborative Software, Productivity, Team Performance Management, Leadership, Meeting Facilitation, Employee Engagement, Collaboration, Leadership Development, Business Correspondence, People Management, Time Management, Communication, Business Writing, Communication Strategies
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Cloud-Native Computing, Docker (Software), .NET Framework, ASP.NET, Application Deployment, Development Environment, Nginx, YAML, Scalability, Microsoft SQL Servers
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Debugging, Integrated Development Environments, Data Validation, Web Applications, Scripting, Development Environment, Object Oriented Programming (OOP), Django (Web Framework), Web Development, Development Testing, Customer Data Management, Data Structures, Program Development, Scripting Languages, Business Logic, Financial Data, User Interface (UI), Python Programming, Software Development Methodologies, Command-Line Interface
Intermediate · Specialization · 1 - 3 Months

Amazon Web Services
Skills you'll gain: Amazon DynamoDB, NoSQL, Serverless Computing, Database Systems, Database Management Systems
Mixed · Course · 1 - 4 Weeks

Skills you'll gain: Cascading Style Sheets (CSS), Hypertext Markup Language (HTML), Web Applications, Javascript, Web Design, Web Development, Front-End Web Development, Animation and Game Design
Intermediate · Guided Project · Less Than 2 Hours

Board Infinity
Skills you'll gain: CI/CD, Jenkins, Docker (Software), Continuous Integration, Containerization, Scalability, Application Deployment, Continuous Deployment, Spring Framework, Spring Boot, DevOps, Prometheus (Software), Cloud Development, Amazon CloudWatch, AWS Identity and Access Management (IAM), Amazon Web Services, Load Balancing, OAuth, Performance Tuning, System Monitoring
Advanced · Course · 1 - 4 Weeks