I was just writing my code and put a // TODO: comment line, so I don’t forget then on the left side a unknown little icon appears.
Does anyone know what this means and how to use this? I could not find anything about this extra feature thingy. Are there more of these? Can one search for “TODOs” somehow?
Thanks

This link should help explain it.
To view the added tasks, you have to open the Tasks window, which is different from the Task List Window. To open the Tasks window:
If you don’t see general, try typing “task” in the filter text box.