I have started maybe 5 years ago or more with a Parallax Boe-Bot. But my current projects are not really related to it.
The last years I worked on a self-driving car, first based on a modified RC car, that was driven by a neural net. However it did not perform reliably, so I experimented with several parameters (of the car, but also to have more prediction time for the NN) in a simulation, which ended up working successfully. Recently, I found a good hardware base (a small size car powered by a jetson-nano), where I could transfer what I learned in the simulation to the "real" world.
I am not sure how active this community is or how welcome such "external" projects are, but I like the overall atmosphere here. (I used to lurk on LMR, but haven't found anything equally active/similarly diverse as there).
As sharing is half the fun of making projects and learning, I thought about sharing this, and maybe some smaller electronics things, later.
I suppose the most fitting category would be "robotics"?