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All of robotics covers a very large number of technical areas (mechanical, electrical, software, algorithms), so I would say it depends which aspects of robotics you are interested in right now. If you have a halfway decent desktop/laptop computer, you can definitely do most of your learning/exploring in the software simulator. It's not as satisfying as making a real object move, but the crashes are also less expensive.

The difference between foxy and humble is that humble will have more features implemented and a lot of bugs fixed. However, most of the concepts & software APIs in the two versions should be the same.

All of robotics covers a very large number of technical areas (mechanical, electrical, software, algorithms), so I would say it the decision to buy a robot with ros2 installed depends which aspects of robotics you are interested in right now. If you have a halfway decent desktop/laptop computer, you can definitely do most of your learning/exploring in the software simulator. It's not as satisfying as making a real object move, but the crashes are also less expensive.

The difference between foxy and humble is that humble will have more features implemented and a lot of bugs fixed. However, most of the concepts & software APIs in the two versions should be the same.