@JoJoLi, my son took a gap year before college and said he was glad he took it. He was tired after his senior year (hard work and a medical problem that needed surgery). He actually applied for college during his gap year. He said he felt more mature than some of his classmates because of the extra year of maturity and his choices were better. He also was glad he was rested.
It never affected anything with respect to jobs etc. He got into quite a few very good colleges.
I didn’t take a gap year between college and grad school and wish that I had.
I encouraged my daughter to take one. She didn’t. She transferred after the first semester, though that was not due to immaturity or not taking a gap year, but I saw her maturity amp up a year later.
I’d highly recommend it.