fun ‧ da ‧ men ‧ tals /ˌfʌndəˈmentlz/ BrE AmE noun [plural]
[ Word Family: noun : ↑ fundamentals ; adverb : ↑ fundamentally ; adjective : fundmental]
the fundamentals (of something) the most important ideas, rules etc that something is based on:
an introduction to the fundamentals of design and print production