basic

noun1 of 2

at the most important or easiest (beginner) level

• “Some people can afford anything while others lack basic necessities.”Tatoeba
• “It's a good idea to brush up on the basics.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

adjective2 of 2

Necessary, essential for life or some process.