adjective
[more ~; most ~]
forming or relating to the most important part of something
forming or relating to the first or easiest part of something
not including anything extra
noun
plural -sics
basics [plural] :the simplest and most important parts of something (such as a subject of study)
[noncount] chiefly US :basic training
get/go back to (the) basics
to return to a simpler way of doing something or thinking about something