Currency
Scotland uses the UK pound sterling and is not on the euro. Three Scottish banks, Bank of Scotland, Royal Bank of Scotland and Clydesdale Bank, issue their own banknotes, which circulate completely normally in Scotland. They are usually accepted in England but are occasionally refused by small independent shops and by ticket and vending machines, so spend Scottish notes before you head south. If a card terminal offers to charge you in Canadian dollars, decline and pay in pounds; that is dynamic currency conversion and it always costs you more than your own bank's rate.
Cards, buses and trams
Contactless is accepted essentially everywhere, including on transport. Lothian Buses runs TapTapCap: just tap your contactless card or phone when you board, every time, and the system works out the cheapest adult daily or weekly fare for you, with no need to tell the driver where you are going. If you pay cash on a Lothian bus it is exact fare only and you will not get change. On Edinburgh Trams the rule is different and catches people out: you must tap the validator on the platform before you board and tap off again after you get off, or the capping cannot be applied.
Visitor levy
Edinburgh charges a visitor levy on paid overnight stays and it is now in force. It applies to hotels, B&Bs, hostels, serviced apartments and campsites within the City of Edinburgh, is capped at the first five consecutive nights of a stay, and is added to your accommodation bill. Expect it as a line item you may not have seen at the time of booking, and check the rate and any exemptions directly on edinburgh.gov.uk.
Power
Type G three-pin plugs on 230 volts at 50 hertz, the same as Ireland and the rest of the UK, and different from both the Canadian two-pin and the round-pin europlug used across most of the continent. If you are combining Scotland with France or Spain you need two different adapters. Chargers for phones and laptops handle 230 volts; a 120-volt Canadian hair dryer or curling iron does not.
Tap water and language
Edinburgh's tap water is soft, safe and pleasant, so refill rather than buying bottles. One local quirk worth knowing: drink from the cold kitchen tap rather than the bathroom tap in older tenement buildings, where the bathroom supply may still come from a roof storage tank. English is universal. A strong Scots accent and local vocabulary are not a language barrier, and asking someone to say it again is completely unremarkable here.
Tipping, and the real traps
Tipping is voluntary. Around ten percent in a table-service restaurant if no service charge is already printed on the bill, and nothing at all when you order and collect at a bar. Edinburgh is a low-crime city, so the actual risk to your wallet is commercial rather than criminal: Royal Mile clan-and-tartan shops selling mass-produced imported goods as heritage, 'find your family tartan' upsells, and roving performers who demand payment after you have photographed them. During the Fringe, buy show tickets only from the official Fringe box office or the venue itself, never from resale sites or people selling on the street.