1) Get out of debt first
Don't start saving money before you eliminate debt first. The interest that you pay on your credit cards and loans kills most of your saving efforts. Save only for emergencies and focus all your efforts on getting out of debt.
2) Credit card payments on time
Always pay the full outstanding amount on time. Save yourself from unnecessary interest.
3) Use only ATMS of your bank
Reduce ATM charges by using only your bank's ATMs. This may not seem like a big deal, but if you use your ATM card once a week in other banks' ATM machines, then by the end of the year, you have actually wasted around 100$.
4) Live near your work
People seem to underestimate the costs associated with living far from their work place: fuel, stress, lost time just to name few. Consider this option seriously.
5) Drink a lot of water
It is good for your health and makes you eat less, lowering your bills especially when you dine out.
6) Bring lunch to work
As a general rule, avoid eating outside and this includes your lunch breaks.
7) Sign up for reward programs
Sign up for every reward program that comes in your way. You are buying anyway, why not get something in return.
8) Buy in Bulk
Save money by buying bulk quantities. Make sure that the bulk quantities don't expire soon and that you will be able to utilize all of it. For example, dish washing soap is guaranteed to survive for a long time but not cheese.
9) Buy in Bulk with a friend
For items having a short life span, consider buying bulk quantities with a friend then split the costs and the items with them.
10) Make use of offers
Make use of offers when you go shopping. Plan your meals around the discounted items. The different items will take turn in the discount loop, so diversity will not be an issue here.
11) Buy from specialized markets
Vegetables from the vegetables market. Fish from the fish market, etc… Specialized markets are almost always cheaper than generic supermarkets. Proximity may be a key factor. See what works best for you.
12) Buy big portions
A 500 ml dish washing soap bottle is cheaper than a 250 ml one. Save money by buying big portions. As with bulk quantities above, make sure that will be able to use all of it.
13) Make a list before you go shopping
Don't wander around supermarkets guessing what you need. Make a list and stick to it.
14) Don't shop while you are hungry
When you are hungry, you are naturally more impulsive and will start buying food in quantities that you may not be able to consume.
15) Turn off the lights/appliances
Turn lights off when you leave a room or when you don't require them anymore. Not only you will be saving money, but also saving the environment. Around 35% of your energy bill is waste. Depending on where you live, you can save around 750$ in a year in energy costs.
16) Use energy efficient bulbs
Use only energy efficient bulbs. They are more expensive than regular bulbs but they will save you a lot of money on the long run. Energy friendly bulbs use approximately 65% less energy than classical bulbs. Doing the math, this would add up to 300$ in savings in a year.
17) Make use of sale
It is a good idea to wait until items are discounted before you buy them. Also, by waiting, you are actually validating your decision. If you can live without something for one or two months, then maybe you don't need it in the first place.
18) Pass on extended warranties
Extended warranties almost never make sense, especially if the item is not expensive.
19) Cancel unused services
Save money by cancelling unused credit cards, memberships, subscriptions, TV channels, etc…
20) Book airline tickets/hotels early
This requires planning and dedication but it saves you tons of money. The earlier you book your tickets and hotels, the more you save.
21) Inflate your tires
Inflate your tires to the recommended level. It is much safer. Partially inflated tires could cost you anywhere between 50$ to 200$ every year.
22) Avoid hard accelerations
Don't accelerate or decelerate aggressively. Hard accelerations are the number one reason behind fuel depletion while hard deceleration ruin your brakes. You can save up to 200$ a year if you avoid hard accelerations.
23) Don't use your car's AC
Your car's AC is not free. It comes at cost. Don't use it if you don't need it.
24) Keep windows closed
Driving fast with open windows increases your fuel usage significantly because the wind holds your car back and opposes its movement. It might be wiser to use AC in this case.
25) Remove things from your car
Don't keep unnecessary items in your car. They increase the weight of your car, which results in additional fuel consumption. An extra 10Kg of weight could cost you around 100$ in fuel money yearly.