Introduction

ROS 2 is the middleware and robotics software framework that connects the different parts of a robot system — nodes, topics, services, actions, parameters, interfaces, and the tools and frameworks built around them. It provides the communication and integration layer that allows sensors, controllers, planners, simulators, and higher-level robotics capabilities to work together as one system.

What's covered

• ROS fundamentals — what ROS is, why it exists, hardware abstraction, distributed computation, and the ROS computational graph
• ROS 1 vs ROS 2 — architectural differences, DDS, RMW, discovery, QoS, lifecycle management, security, and when the concepts matter
• Core ROS 2 communication — nodes, topics, services, actions, parameters, messages, interfaces, and standard message types
• ROS 2 development workflow — packages, workspaces, ament, colcon, launch files, parameters, CLI tools, and ros2 bag
• QoS and middleware — reliability, durability, history, discovery, ROS_DOMAIN_ID, and communication debugging
• tf2 and robot frames — coordinate frames, transformations, timestamps, and the map → odom → base_link relationship
• Robot description and simulation — URDF, Xacro, SDF, Gazebo, simulation time, and simulator integration
• Navigation and manipulation — Nav2, costmaps, localization, SLAM, MoveIt 2, planning scenes, inverse kinematics, and motion planning
• Hardware control — ros2_control, hardware interfaces, controller_manager, and common controllers such as differential-drive control
• Debugging and engineering practices — executors, callback groups, testing, tracing, diagnostics, real-time considerations, security, and multi-robot systems
• Practical learning path — progressing from a basic publisher/subscriber system to a complete mobile robot or manipulator pipeline

Recommended resource

Use the provided book below as the main reference for studying these topics.

Start with the early chapters for the ROS 2 fundamentals, then follow the book's recommended progression into QoS, tf2, simulation, Nav2/MoveIt 2, and ros2_control. The book is designed to be used alongside the ROS 2 Intro slides and includes concepts, commands, code examples, debugging workflows, and practical project guidance.

ROS 2 Complete Study Guide — Beginner to Advanced

Resources

Reference Links