I am a big fan of learning mathematics through two-step transcription process: first handwriting notes (the way the Invisible Pink Unicorn in the Sky intended!) and then writing them up with Tex. Hopefully soon I'll get around to putting up solutions and notes I find might be useful. Stay tuned!
Pictured: The Joint Trail in the Needles District of Canyonlands July 2015. Not pictured: the 105 degree weather.