If you’re new here and not sure where to begin, start with the Maritime Robotics Landscape “Getting Started” guide: https://ros-maritime.oceansoft.org/getting_started/
You don’t need a robot or access to water to start learning. The guide walks you through getting a virtual vehicle running in simulation.
Practical first steps:
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Install ROS 2 Jazzy
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Pick a simulator and try to get a vehicle running in sim
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Browse the vehicle types and glossary on the landscape site to get oriented
Once you’ve got something running in sim, Toby’s cross-middleware bridges post is a good next read to understand how the different middleware stacks (ROS 2, MOOS-IvP, Goby3) relate to each other.
Post your questions in this category. Nothing is too basic.