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Hello @avzmpy,
Foxy Fitzroy is in the LTS version that means Long term support that means it has support for 3 years. Galactic Geochelone does not provide LTS so it may have the support of 1 year.
In ROS2 each version of ros2 is released in a year and you have one LTS version every two years. I think in 2022 there will be the next LTS version which may have 5 years of support. Over here LTS support means that it is a stable version.
I hope you got your answer, if you have any doubts please! feel free to comment.