Won't make you play like a pro, but at least will make you the feel like one :)
Some quick tips on how to change your PlayerFrame to look like that of an elite mob.
1. Rare Mob Frame script:
/run PlayerFrameTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame-Rare")
2. Elite Mob script:
/run PlayerFrameTexture:SetTexture("Interface\\TargetingFrame\\UI-TargetingFrame-Elite")

The scripts will dissapear after reload, relog.

A more..permanent method is downloading Elite Player Frame (Enhanced) addon:
[ Ссылка ]

The Elite frame from video thumbnail is made by:
[ Ссылка ]

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