ROS Official Documentation
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Official ROS 2 Humble documentation: installation guides, beginner and intermediate tutorials on nodes, topics, services, actions, launch files and tf2, plus API references. Working through it leaves you able to build and debug your own ROS 2 packages.
More resources on Robot Operating Systems
Articulated Robotics
Josh Newans' written and video tutorials for building a ROS 2 mobile robot end to end: URDF modelling, Gazebo simulation, ros2_control, LIDAR and camera integration, and navigation. Learners finish able to run a complete robot software stack on a Raspberry Pi.
ros.org
ROS.org is the official portal for the Robot Operating System, a flexible, open-source framework for building robot software. It provides comprehensive documentation, tutorials, API references, distribution releases, and community resources to help learners and developers build and deploy robotics applications.
wiki.ros.org
ROS Wiki is the official documentation hub for the Robot Operating System, offering install guides, tutorials, API references, and package listings for developing ROS software, covering both ROS 1 and ROS 2.
ROS Discourse Forum
Official ROS community forum run by Open Robotics, where maintainers post release announcements, REP proposals, working-group notes and package news. Reading it tells you which distributions and libraries are actively maintained and where current design discussions stand.
The Construct
YouTube channel of the ROS training company The Construct, with tutorials and live classes on ROS and ROS 2 nodes, topics, navigation, Gazebo simulation and robot programming, so viewers can build and simulate robot software step by step.
Programming Robots with ROS
Practical O'Reilly guide by three core ROS developers, working through nodes, topics, tf, navigation, manipulation and perception on real and simulated robots. After it you can assemble a working ROS 1 application rather than only run tutorials.