SUM: ALT+
FILTER: CTRL SHIFT L
TABLE: CTRL T
In Formulas
hit Create from Selection
which creates quick references to any selected range of data. Don't forget to include your selection header if exists.
Then when using for instance =AVERAGE(selection_name
) use the selection name as the
input range.
If you can't remember the selection name, hit F3
when typing it into the formula.