what is a standard seating?

First come first served, stadium seating

It has regular seats. They don't recline and are not over-stuffed. Just regular sloping ground not stadium style.

First is arrive = good seats.

You don't have the opportunity to choose your seats. You can sit anywhere you like. Just to let you know, the chairs are not reclinable and they are hard like in the olden days.

Some movies allow you to choose your seats when purchasing tickets. Usually for the more popular showings. Otherwise yea show up early or sit in the front

First come, first served.

Early bird gets the prize ;)