Pay the required minimum %age into the employer pension scheme, no more at the start of your working life - you cant get it back until your're 55 so useless for house deposit etc.
Save money into a more accessible savings scheme for house deposit, or car or holidays or as a buffer. Look at a lifetime ISA where govt top up if you meet criteria. Regular savings accounts usually give better interest than normal accounts. No harm in having 2 or more savings accounts for different purposes. Stay away from ISAs linked to stock market or unit trusts etc unless you are willing and able to research and accept the risk of loss of capital in case of market downturn.
Spend time on money websites such as Martin Lewis' www.moneysavingexpert.com to get advice and for info on best deals for interest rates etc. Use website comparison sites for insurance, utilities, holidays, car leasing, etc.
Always check you direct debits and standing orders for utilities, insurance, mobile phone, etc - cancel things you dont need, shop around at end of contract term for better deals, especially mobile phone contracts.
Join loyalty schemes (Clubcard, Nectar etc) - the savings/benefits look small but build up over the years - we've just bought a microwave with our nectar points.
Get credit cards/current accounts that give you benefits such as cash back, travel insurance etc. Watch that any monthly/annual fees are less than the benefits you get. For credit cards, pay off in full every month to avoid paying interest.
ALWAYS read the small print with ANY contract, lease, etc - don't sign anything you don't fully understand. You need to know how long you're committed for, what happens at end of contract, whether you have early termination rights (and at what cost), extra costs, etc etc.