Turning Left
When turning left, give way to oncoming traffic going straight or turning right. Pull well into the junction and wait for a gap. Never turn 'on faith' when your view is blocked by another left-turner behind you.
The right-hand rule, yielding and main roads

At unsigned junctions, the right-hand rule applies: you give way to vehicles coming from your right. The rule applies even when you're on what looks like the 'bigger' road. Don't assume road width or speed gives you priority — signs decide.
Give way (triangle sign): slow down, stop if needed. Stop (octagon sign): you must come to a full stop, even on an empty road. Main road (yellow diamond): you have priority over traffic from side roads, but not automatically when turning left or against oncoming traffic.
When turning left, give way to oncoming traffic going straight or turning right. Pull well into the junction and wait for a gap. Never turn 'on faith' when your view is blocked by another left-turner behind you.
Trams have special right of way and can't dodge you — you yield to the tram. Emergency vehicles with blue lights and sirens get a clear path, even if that means mounting a kerb or passing through a red light when it's safe to do so.
Priority means others must yield to you — not that you may drive even if it would crash. If someone is in your way who shouldn't be, you wait. Safety always overrides priority.
The exam likes to combine the right-hand rule with a left turn in the same question. You may have to yield to the car on your right AND to oncoming traffic going straight — both at once. Judge each vehicle separately.
You're turning left at an unsigned junction. A car comes from your right, an oncoming car goes straight. Who do you let through first? Both — you stay put until both have passed. Don't think 'my turn' until the street is clear in both directions.