Take a look at your daily expenses.
Start with food. How often do you eat out or get takeout? How expensive are these places? Do you find yourself overeating, or throwing anything out? If so, then buy food storage containers (like rubbermaid) and start freezing part of these meals.
When food shopping, do you buy prepackaged or prepared foods, or the raw ingredients? Frozen macaroni and cheese costs more per serving than the boxed kind,which in turn costs more than uncooked pasta and a block of cheese you have to grate yourself.
Learning to cook saves money, and you can control portions (less waste that way) and fat and calories. If you work all day away from the home and are just too tired to cook, buy a slow cooker (they run around $40) and check out YouTube videos on how to use it.
Also comparison shop and use coupons. Start buying whatever is on sale and in season.
For entertainment, consider what you do. Is it drinking at bars? That's not just dangerous these days-- it's expensive. Think of other things that you can do which are fun.
Look at your bills. Can you cut your phone plan to one where you have less data usage? Can you get rid of premium cable channels on your TV? Can you make your current phone, TV, computer, and car last several more years?
Write down a budget. These ideas will help you stick to it.