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I'll use this github project as a central place to organize all of my hobbyist electronics knowledge and projects.

ATtiny85:

• ATtinyPinoutDiscovery: Baffled why your ATtiny85 Arduino sketch doesn't work? You might just be confused about the pin ordering. This sketch blinks an LED on each pin, and the number of blinks indicates the Arduino pin number.
• ATtiny85SerialHello: A simple Arduino sketch for the ATtiny85 which prints "hello" repeatedly over a 9600 8N1 software serial connection and blinks an LED. This should be your first step in getting software serial working on an ATtiny85.
• CalibrateATtiny85OSCCAL: Tutorial (with Arduino sketch) on how to calibrate the internal oscillator of the ATtiny85.

LTSpice:

• LTSpice-parts: A collection of parts commonly used by hobbyists with instructions on how to get LTSpice to use them (every 6 months I completely forget how to make LTSpice use 3rd party parts).

Circuit Patterns:

Inspired by http://www.arachnidlabs.com/blog/2013/10/17/electronics-patterns/

• Capacitor Multiplier

Circuits to read later:

Power Supply circuits:

• from eevblog forum user 'blackdog': http://www.bramcam.nl/NA/NA-01-PSU/NA-PSU-SCH-17.gif
• from eevblog forum user 'void_error': http://www.eevblog.com/forum/projects/high-side-current-sense-circuit-jelly-bean-parts-only/msg577224/#msg577224

Analog circuits:

• go through the Seven Fourty Fun LTSpice model of the uA741 op amp: https://github.com/OpenAnalog/SevenFortyFun

Documents to read later:

• Analog Devices Electronics I and II online course