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Design patterns for scalable ROS 2 systems: node composition, lifecycle management, DDS tuning, QoS profiles, and real-time executor configuration. Read Guide → Comprehensive comparison of sampling-based (RRT*, PRM), optimization-based (CHOMP, TrajOpt), and hybrid planners with OMPL and MoveIt 2 integration. Read Guide → Visual perception pipelines: feature detection, SLAM frontends, object detection (YOLO, DETR), depth estimation, and multi-camera calibration with OpenCV and ROS 2. Read Guide → High-fidelity simulation: SDFormat models, sensor plugins, physics tuning, ROS 2-Gazebo bridges, headless CI/CD integration, and domain randomization for sim-to-real. Read Guide → Robot control theory applied: inverse kinematics solvers, impedance/admittance control, force/torque sensing, trajectory optimization, and real-time control loops at 1kHz+. Read Guide → Nav2 deep dive: behavior trees, costmap layers, recovery behaviors, BT Navigator, controller plugins, and custom costmap filters for dynamic environments. Read Guide → Coordination algorithms: task allocation (market-based, consensus), formation control, collision avoidance (ORCA, CBS), and fleet management with ROS 2 DDS partitioning. Read Guide → Closing the reality gap: domain randomization, system identification, dynamics adaptation, residual learning, and real-world deployment pipelines with Isaac Sim and ROS 2. Read Guide → Testing strategies: unit/integration testing with gtest, hardware-in-the-loop (HIL), simulation-in-the-loop (SIL), ROS 2 launch testing, and GitHub Actions pipelines for robotic fleets. Read Guide → Microcontroller robotics: micro-ROS on MCUs, FreeRTOS/Zephyr integration, DDS-XRCE, real-time constraints, memory optimization, and cross-compilation for ARM Cortex-M/R. Read Guide → Categories ROS 2 (1) Motion Planning (1) Computer Vision (1) Simulation (1) Control (1) Navigation (1) Multi-Robot (1) Sim2Real (1) Testing (1) Embedded (1)