Magento U has published a free course Fundamentals of Magento 2 Development

Magento U has published 4 free courses:

• Fundamentals of Magento 2 Development (English)
• Core principles for theming (English)
• Managing your Magento 2 Store (English)
• Responsive Web Design in Magento 2 (English)

Which will be available until March 31, 2017 is absolutely free for everyone.
Courses include a set of video lessons, as well as pdf materials and presentations with tasks and tests at the end of each lesson, which will help to quickly understand the architecture of Magento 2.
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Course content under habrakat.

The course Fundamentals of Magneto 2 Development consists of the following units:

• Unit 1: Preparation & Configuration
  
  
  • Preparation
  • Overview and Architecture
  • File systems
  • Configuration
  • Dependency Injection (DI) & Object Manager
  • Plugins
  • Events
  
  
• Unit 2: Request Flow
  
  
  • Request Flow Overview
  • Request routing
  • Controller architecture
  • Working with controllers
  • URL Rewrites
  
  
• Unit 3: Rendering
  
  
  • Rendering Overview
  • Rendering flow
  • View Elements
  • Block Architecture & Lifecycle
  • Templates
  • UiComponents
  • Layout XML Structure
  • Layout XML Loading & Rendering
  
  
• Unit 4: Databases & EAV
  
  
  • Databases Overview
  • Models Workflow
  • Setup Scripts & Resources
  • Entity-Attribute-Value Concepts
  • EAV Load & Save
  • Attribute management
  
  
• Unit 5: Service Contracts
  
  
  • Service Contracts Overview
  • Service API: Framework API
  • Service API: SearchCriteria, Repositories, Business Logic
  • Data API
  
  
• Unit 5: AdminHTML
  
  
  • Adminhtml Overview
  • Grids: Filters, Datasource, Listing UiComponent
  • Grids: Grid Indexer, Columns, Paging
  • Forms
  • Sys Config, Menu, ACL