MAXX(Table, Expression)

MINX(Table, Expression)

COUNTX(Table, Expression)

CALCULATE(Expression, Filter1, Filter2, ...): Changes filter context.

Sales Last Year = CALCULATE([Total Sales], SAMEPERIODLASTYEAR('Date'[Date]))

ALL(Table/Column): Removes all filters from a table or column.

Total Sales All Products = CALCULATE([Total Sales], ALL(Product))

ALLEXCEPT(Table, Column1, Column2): Removes all filters from a table *except* for specified columns.

FILTER(Table, Filter_Expression): Returns a table filtered by the expression.

High Value Customers = CALCULATE([Total Sales], FILTER(Customer, Customer[TotalPurchases] > 1000))

Requires a marked Date Table.
TOTALYTD(Expression, Dates_Column, [Filter]): Year-to-date.
TOTALQTD(Expression, Dates_Column, [Filter]): Quarter-to-date.
TOTALMTD(Expression, Dates_Column, [Filter]): Month-to-date.
SAMEPERIODLASTYEAR(Dates_Column)
DATEADD(Dates_Column, Number_Of_Intervals, Interval) (Interval: DAY, MONTH, QUARTER, YEAR)
DATESBETWEEN(Dates_Column, StartDate, EndDate)
PREVIOUSMONTH(Dates_Column), PREVIOUSQUARTER(Dates_Column), PREVIOUSYEAR(Dates_Column)