This meaning refers to the order of things. If something is first, it is at the beginning or coming before all others.
She was the first student in line.
He finished the race in first place.
This meaning is about the time something happens. The first event is the one that takes place before others.
We will go to the first movie show.
I wake up at first light every day.
This usage indicates something that is the initial example or type among others. It emphasizes being the first of its kind.
He was the first author of the report.
This is the first version of the software.
Here, 'first' refers to the beginning segment or division of a larger work, like a book or a film.
The first of the series was very exciting.
I read the first chapter last night.
In this context, 'first' refers to the very first effort or experience in doing something new.
This is my first attempt to bake a cake.
He made his first speech at the event.