Fetching details from the dictionary...

head (of a line, group, etc.); front; lead; forefront; vanguard
マラソンで先頭を走っている選手は速い。
The athlete running in the lead in the marathon is fast.
先頭に立って案内してくれて助かった。
It was helpful that you took the lead and guided us.
行列の先頭に並んで開店を待っていた。
I was at the front of the line waiting for the store to open.