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HTTP status codes
What each response code is telling you
Git essentials
The commands you reach for every day
SQL basics
Query, filter, join and summarize
Python basics
Syntax and idioms worth knowing by heart
Swift essentials
Optionals, value types and the idioms of Swift
World capitals
Capital cities, one country at a time
Periodic table: first 30
Symbols, names and numbers for the first thirty elements
English irregular verbs
Base form, past simple and past participle
Spanish for beginners (A1)
First words and phrases, with English on the back
Math & geometry formulas
Areas, volumes, algebra and trigonometry in one place
Physics & chemistry formulas
The equations behind motion, energy, electricity and gases
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