basics
noun /ˈbeɪsɪks/
  /ˈbeɪsɪks/
[plural]Idioms - basics (of something) the most important and necessary facts, skills, ideas, etc. from which other things develop- the basics of computer programming
- This range of books for young children covers basics like the alphabet and numbers.
 Extra Examples- The book covers the basics of massage.
- The important thing is to get the basics right.
 Oxford Collocations Dictionaryverb + basics- grasp
- know
- learn
- …
 - get the basics right
 
- the simplest and most important things that people need in a particular situation- Some schools lack money for basics like books and pencils.
- It's best to stick to basics when planning such a large party.
 Oxford Collocations Dictionaryverb + basics- grasp
- know
- learn
- …
 - get the basics right
 
Idioms 
go/get back to basics 
- to think about the simple or most important ideas within a subject or an activity instead of new ideas or complicated details- Managers should get back to basics and examine the kind of products people really want.
- It's time our education system got back to basics.