Correct
班门弄斧
/ bānménnòngfǔ /
Strokes
Definition
to display one's slight skill before an expert (idiom)
Example
Definition
show off one's skill with the axe before Lu Ban (the master carpenter)—show off one's skill before an expert; parade one's learning before a great scholar; teach fish (how) to swim; teach one's grandma to suck eggs