THE GRAMMAR OF ADMONITION

English for Today by Ganiu Abisoye Bamgbose (Dr GAB)

THE GRAMMAR OF ADMONITION

You can’t know about everything; always ~stay on your lane~ (nonstandard).
You can’t know about everything; always stay in your lane (standard). The phrase stay in your lane is used as a term of admonishment or advice against those who express thoughts or opinions on a subject about which they are viewed as having insufficient knowledge or ability.

Pick a field and know the ~in and out~ of it (nonstandard).
Pick a field and know the ins and outs of it (standard). The ins and outs of a situation are all the detailed points and facts about it.
GAB