The first 6 lessons of ROS tutorial for Husarion CORE2 are available here https://husarion.com/core2/tutorials/ros-tutorials/1-ros-introduction .
Instructions are created for ROSbot, but you can learn a lot if you have only CORE2-ROS.
Covered topics are:
- ROS introduction
- creating nodes
- simple kinematics for mobile robot
- visual object recognition
- running ROS on multiple machines
- SLAM navigation
- Path planning
- Unknown environment exploration
Check it out!