Remember which way magnetic field lines on a magnet travel
Magnetic fields have the convention that they travel from north to south on a magnet.
How can we remember this?
If we start with the north end of the magnet, which we should recognise from previous pictures as being coloured red, then the following picture will help you remember the arrow direction:
Remember that Santa in red leaves the north pole to deliver all the presents.
Santa in RED LEAVES the NORTH POLE
LINES LEAVE THE MAGNET AT RED AND NORTH