よくあることです

it's common

→ 良く
phrase Rare #41,894
it's common A polite expression meaning that something happens often or is a common occurrence. よくあることですが means “although it is common.”
JA: 仕事でミスをするのはよくあることです。
EN: Making mistakes at work is common.

生徒が朝ご飯抜きで学校に行くのはよくあることです

It’s common for students to go to school without eating breakfast.

よくあることです

It happens often.

— バジュランギおじさんと、小さな迷子 (2015)

年配の人にはよくあることです祖父は早寝早起きをします

Like many older people, my grandfather goes to bed early and gets up early.

彼にはよくあることです授業に遅刻してしまいました

As is often the case with him, he was late for class.