One tip to travel in Brigthon is to use the bus network. You can cross all the city with the bus.
But be careful, it could become very expensive if you buy ticket by ticket in the bus (from £2 to £2.50) !
So, if you can, go to the 1 Stop Travel (26 North Street, in front of the big building of The Post & Telegraph) and buy a City Saver for the period you are in the city. It could be on a key (a card) or on you mobile through the application. If you are students, you can get over 25% off adult fares, but only with an English or international student card !
And, to search your travel, it’s right here : http://www.cartogold.co.uk/brightonhove/