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Binary and Bitwise Operations
Binary / Octal / Decimal / Hexadecimal Counting Visualizer
Practice adding two 8-bit hexadecimal numbers together. Click the ▶ Run button to bring up the fields.
YouTube playlist of all video course materials.
A hackable editor for the 21st century.
Literally the future of
A beginner's guide to Linux and the command line.
A somewhat more in-depth guide to the command line.
Invaluable, free (as in beer) textbook for microcontroller basics.
Since Learn C the Hard Way is no longer available for free, this is a good alternative.
Though, for $30, it is worth it.