Cheats for those who make the first steps

The picture shows a fragment of an excellent crib, where the main electronic components are assembled - their appearance and designations on the circuit diagrams.

Cheat Sheet by Electronic Components (PDF, 168Kb)
Cheat Sheet on AVR Controllers (Part 1) (PDF, 61Kb)
Cheat Sheet on AVR Controllers (Part 2) (PDF, 61Kb)
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PS: In the same place, on a site, there is a curious blog with the description of effective electronic hand-made articles. Culture performance at a height, provides links to open source firmware.