In Google Sheets how to reference infinite rows in column?

Question

If I want to reference a span of rows I can do something like A1:A100. If I want to lock the column/row I can use $; $A1:$A100.

Is

Answer 1

Google sheets is more flexible, you can use the syntax

=Sum(A2:A)

or even

=Sum(A2:C)

You can also do the same with rows e.g.

=Sum(B2:2)