I'd like catch up the Arduino concepts (programming & IDE). There are excellent online tutorials available for Arduino but all of them which I saw are made for those who didn't have embedded/electronics background. Going through them is heavily time consuming as I'm already familiar with the embedded programming other than Arduino or Raspberry Pi.

Does any one know any quick reference materials for Arduino which excludes electronic/embedded basics which is meant for experienced embedded programmer? That could be a big time saver for me.

Thanks in advance!