I was thinking this could be a very nice thread to share what newbies like us have learnt for the day which excite(s) us. Think experience-sharing. =) Let me start the ball rolling.
I was out shooting leisurely today for a seminar in a hall where the white balance got really screwed because of sunlight shining into the hall with the hall lightings altogether. No presets could give me the kind of colour rendition I wanted. Then I took my flip-out bounce card of the flash and started using custom WB and boy am I amazed! Well at least to me, it was something that I thought on my feet without any white paper around and I thought it will be something which will internalise.
How about yours?