There are a number of ways of carrying money, or at least getting access to it, as you travel.
However, there can sometimes be problems converting that money into the local currency in terms of excessive fees, terrible exchange rates, or even not knowing how much to change (for example, when converting too much in an attempt to save money).
The four main choices are listed below with their respective advantages and disadvantages. The fees and rates change all the time so don’t rely on any figures given, rather check the Internet for updates.
Keeping your money physically secure [...]
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Once, whilst returning from a trip to Italy, I met a man on a train who was travelling dressed only in a swim suit and a towel. He had left his bag on the beach for just a few moments to paddle in the sea. When he returned it was gone, along with his passport, money, tickets and all of his clothes (apart from his towel).
Write lists of phone numbers and addresses of emergency contacts, friends you will be visiting, numbers to call if you lose things and need to cancel services or get replacements sent to you (your cell phone and credit cards, for example), phone numbers and addresses of embassies/consulates, and perhaps addresses of useful travel-related websites.
Take any travel insurance information you’ll need if you have to make a claim while travelling. This would include the company’s claims telephone number and a checklist of things you may need to provide when calling (like the plan code, travel dates, the date the insurance was purchased, and so on).
STA Travel, where you can get travel insurance from just £8, as well as 
A vaccination certificate may be required if you have previously visited areas where specific diseases are widespread or when visiting countries where there are increased health risks for travellers. This is usually a yellow card which is like an international certificate of vaccination or medical passport.