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Fedora 4 introduces a number of new features and stuff:

• a different kind of  object model  that allows (and, even encourages) hierarchy
• "native" RDF expressions of object properties
• a RESTful REST HTTP API that is consistent and follow-your-nose
• integrated support for low-level fixity checks
• asynchronous, event-driven points of extensibility 

We expose our underpinning technologies (at the Java API level, at least) for developers, so it is also helpful (and sometimes even necessary) to be familiar with the features and functions those technologies offer:

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Cache Loaders and Stores

Eviction

Introduction

First Steps

The Fedora object model

REST HTTP API

Features

Authentication and Authorization

CMIS

Durability

Event-driven APIs

Fixity Reporting

Policy-driven storage

Metrics Reporting

SPARQL Update

Profiling and Metrics

Search and Discovery APIs

Versioning

WebDAV

How-Tos

Creating a custom Fedora 4 webapp

How to Create a new JAX-RS resource

Deploying Fedora 4

How to Define a Storage Policy

How to Project over Directory of BagIt Bags

How to Run Fedora 4 on AWS

How to setup a Fedora cluster

Sequencers

FAQs

Java VM Options

Fedora 3 => to Fedora 4 migrationConcept Mapping

Hydra and Fedora 4

Islandora and Fedora 4

Performance and Durability Considerations

Performance Testing