Composition is king. Learn all about the golden ratio, Fibonacci/golden spiral, and phi grid. Then put your new knowledge to work and make some great pics, smarty pants.
Remove Color Casts Using Lightroom Adjustment Brush
Canon Rebel tips for action photography
Adobe Lightroom Histogram Cheat Sheet: Learn how to use the master the histogram with this cheat sheet.
How to bypass the Portrait Mode on Your Digital Camera and Get Great Portrait - Digital Photography School