If the moderators feel this has been covered a million times of course please delete my post.
What is the one thing many of you new users and long time professionals/enthusiasts learned that for one reason or another - really helped you speed up your projects or your learning process?
For me it was a few nights ago after struggling to learn to make USI work as an i2C slave for over a week. I was at another amazing fellows site who spends an inordinate amount of time sharing their experience and knowledge. I'm looking at the screen shots in his video for AVR Studio 6 or something and I see this panel called I/O.
I haven't had as much time as I would have liked as I have been looking after my terminally ill mother singlehandedly for the past year until recently. I can't really understand how I A) had never seen it before, B) never found it myself, C) not mentioned very often - is it that obvious?
For me this was like a live, real, applicable window into the datasheets. LOL maybe the people that come here asking for help before reading a datasheet don't know about the I/O window either.
Anyways I would love to hear from others what may seem absolutely obvious to them now was a revelation to learn?