UU Game Terminology - End of Turn Phase

The End of Turn Phase is the last Phase of a Players turn.

A Phase is not completed until all effects have been resolved, then gameplay continues to the next phase, unless a game winning condition is achieved by the player and the game ends.

END OF TURN PHASE
All End of turn effects trigger simultaneously and resolve simultaneously prior to the mandatory hand limit resolution.

DISCARD until the number of cards in your hand does not exceed the hand limit. The hand limit is 7 cards (unless otherwise stated).

What do you mean by "hand limit"? The default hand limit is 7, which means each player can only have 7 cards in their hand after the end of their turn. If you're holding more than 7 cards during your End of Turn phase, discard down to that number (unless you have a card in your Stable that says otherwise).