You don't have to spend money to get quality courses on Udemy. Below is a list I have compiled of free courses that are larger or more thorough than the average Udemy free course. All courses and their content are owned solely by their creators, I only compile a list of links here.
- C++ Tutorial for Complete Beginners
- Crash Course Into JavaFX: The Best Way to make GUI Apps
- Decoding AP Computer Science A
- Windows 10 Programming for Absolute Beginners
- Java for Noobs: Go from Noob to Semi-Noob
- Learn Python, it's CAKE
- Complete Step by Step Java for Testers
- Learn to Build Your First Professional iOS App
- Become an Android Developer from Scratch
- Swift MyWonders App: Core Data, Maps & Media
- iOS9 Apple Watch Toolkit: Make Real Apps From Scratch
- Become an iOS Developer from Scratch
- Rapid Prototyping with Ionic: Build a Data-Driven Mobile App
- Android 4.0 for Java
- Android Processes, Threads Slidenerd Stlye
- Learn Object Oriented PHP By Building a Complete Website
- Learn E-Commerce Website in PHP & MySQL From Scratch
- Beginner PHP and MySQL Tutorial
- Learn Ruby on Rails from Scratch
- ASP.Net MVC Quick Start
- WordPress for Beginners: Create Professional Websites Use
- Javascript Essentials
- AngularJS Essentials
- Practical PHP: Master the Basics and Code Dynamic Websites
- Create Interactive HTML5 Animations with Adobe Edge Animate
- Inspirational Web Development - A Beginner Approach
- Learn HTML5 Programming From Scratch
- Learn Basics of CSS3 From Scratch With Projects
- Learn Bootstrap3 With Multi Purposes Single Page Layout
- Search Engine Optimization for Business
- Database Design
- Database Design (MarkLogic)
- Semantics and the MarkLogic NoSQL Database
- Building XQuery Apps with the MarkLogic NoSQL Database
- Oracle SQL from Beginner to Pro
- Baseball Database Queries with SQL and dplyr
- Oracle Database 12c SQL Fundamentals
- Hadoop Starter Kit
- R Basics - R Programming Language Introduction
- Setup Big Data Development Environment
- Big data Internship Program - Foundation
- Perform Better GeoTechnical Numerical Analysis
- Learning Apache Hadoop EcoSystem - Hive
- R, ggplot, and Simple Linear Regression
- Learn Burp Suite, the Nr. 1 Web Hacking Tool
- Linux Command Line Basics
- Selenium WebDriver Training with Java Basics
- New CCNAx 200-125 Routing and Switching
- So You Want to be a Network Engineer?
- Cisco CCNA Getting Started
- CCNP Route 642-902 Implementing Cisco IP Routing