Second the MSE recommendation. Go through the budgeting stuff and also get the weekly email for ongoing hints and tips about all aspects of making your money go further.
My main tip would be to appreciate the value of lots of little savings adding up and compounding.
The individual savings might seem small but they really add up over time.
A £3 daily coffee might not seem a particularly extravagent expenditure, but if you do it every working day, that's £60 a month or about £700 a year, which would pay for a holiday.
Reducing your bills cost (shop around for gas, electricity, broadband, mobile phone) could easily knock £50-100 a month off the costs).
Look at what you buy in the supermarket and always buy your regular non perishables on special offer, not as and when you need them, always keep a small stock. Either buy in Aldi, Lidl or Home Bargains etc or on offer for toiletries, cleaning products, canned food etc and you can effectively half the price of these items.
All the above adds up massively and becomes second nature after a while. There's probably about £2-3k pa in savings just on those three simple things, that many people don't bother with, but that's £2-3k extra you can put in savings, or have available to spend, with little impact on lifestyle.