Java for Android courses can help you learn app development, user interface design, and mobile programming principles. You can build skills in working with APIs, managing databases, and implementing responsive layouts. Many courses introduce tools like Android Studio and Gradle, that support coding, testing, and deploying your applications effectively.

Skillshare
Skills you'll gain: Photography, Photo Editing, Photo/Video Production and Technology, Storytelling, Geospatial Information and Technology, Geospatial Mapping, Geographic Information Systems, Global Positioning Systems, Creativity, Image Quality, Planning, Research, Creative Thinking, Adobe Creative Cloud, Design Elements And Principles, Aesthetics, Critical Thinking, Data Import/Export
Beginner · Specialization · 3 - 6 Months

Johns Hopkins University
Skills you'll gain: Penetration Testing, MITRE ATT&CK Framework, Cyber Security Assessment, Public Key Infrastructure, Cybersecurity, Threat Modeling, Cryptography, Exploitation techniques, Security Testing, Vulnerability Scanning, Encryption, Technical Writing, Human Factors (Security)
Intermediate · Course · 1 - 3 Months

Akamai Technologies, Inc.
Skills you'll gain: Endpoint Security, Incident Response, Network Security, Vulnerability Scanning, Computer Security Incident Management, Security Management, Penetration Testing, Cybersecurity, Authentications, Vulnerability Assessments, Encryption, Firewall, Identity and Access Management, Hardening, Threat Detection, Disaster Recovery, Public Key Infrastructure, Mobile Security, Risk Management Framework, Risk Management
Beginner · Course · 1 - 3 Months

Skills you'll gain: React.js, Application Deployment, Web Applications, Javascript, Bootstrap (Front-End Framework), Development Environment, User Interface (UI), Cascading Style Sheets (CSS), Application Programming Interface (API), GitHub
Beginner · Course · 1 - 3 Months

Skills you'll gain: Network Troubleshooting, Network Performance Management, Network Monitoring, Technical Communication, Technical Support and Services, Technical Support, Network Administration, Desktop Support, Debugging, Help Desk Support, Problem Management, Network Analysis
Beginner · Course · 1 - 4 Weeks

Johns Hopkins University
Skills you'll gain: Writing, Writing and Editing, Literacy, Storytelling, Language Competency, Creativity, Persuasive Communication
Beginner · Course · 1 - 4 Weeks

Illinois Tech
Skills you'll gain: Regression Analysis, Data Validation, Feature Engineering, Exploratory Data Analysis, Statistical Modeling, Data Transformation, Statistical Methods, Plot (Graphics), Statistical Analysis, R Programming, Correlation Analysis, Time Series Analysis and Forecasting, Statistical Inference, Linear Algebra, Statistical Hypothesis Testing, Probability Distribution
Build toward a degree
Intermediate · Course · 1 - 4 Weeks

Board Infinity
Skills you'll gain: Node.JS, MongoDB, Middleware, Databases, Authorization (Computing), Authentications, Data Validation
Intermediate · Course · 1 - 4 Weeks

Banco Interamericano de Desarrollo
Skills you'll gain: Climate Change Adaptation, Climate Change Mitigation, Water Resource Management, Energy and Utilities, Environmental Policy, Sustainable Business, Risk Management, Environmental Monitoring, Finance, Innovation
Beginner · Course · 1 - 4 Weeks

Coursera
Skills you'll gain: Data Visualization Software, Data Visualization, Interactive Data Visualization, Visualization (Computer Graphics), JSON, Data Mapping, Javascript
Intermediate · Guided Project · Less Than 2 Hours

Scrimba
Skills you'll gain: Web Applications, Full-Stack Web Development, Database Application, Database Development, Query Languages, Real Time Data, Javascript, User Interface (UI), Software Engineering, Authentications
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Routing Protocols, TCP/IP, Network Switches, Virtual Local Area Network (VLAN), Network Protocols, Network Security, Network Routing, Network Troubleshooting, Network Administration, Computer Networking, Open Shortest Path First (OSPF), Dynamic Host Configuration Protocol (DHCP), Border Gateway Protocol, Network Performance Management, Firewall, Proxy Servers, Encryption, Authentications
Intermediate · Course · 1 - 3 Months