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List view

Sales Rep Rank =

RANKX(
	ALL( Sales[Sales Rep]),
	[Total Sales],
	Dense
)

//Dense = not skip

Best Selling Day/Date =

CONCATENATEX(
	TOPN(
		1,
		'Calendar',
		[Total Sales]
		),
	FORMAT( 'Calendar'[Date], "dd-mmm" )
	)

Top Selling Product =

TOPN(
	1,
	VALUES( Sales[ProductID] ),
	[Total Sales]
)

Best Selling Day/Date =

TOPN(
	1,
	'Calendar',
	[Total Sales]
)

Week Rank = 

RANKX(
    ALL( 'Calendar' ),
    'Calendar'[Week StartDate], , ASC, Dense)

DAX | Rank Sales Rep based on Total Sales