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Probably the most effective things that you can do are lower screen brightness and turn off Bluetooth unless you actually need it. I know that you can put screen brightness on auto, but on a lot of devices I find it makes it too dark when it’s, er, dark, so I prefer to manually set it. Wi-Fi can either help or harm battery life - it will help if you use a Wi-Fi network that is available, but if you are out and it is constantly searching for a network, that will waste your battery. Turn Wi-Fi on or off accordingly. You can also turn off GPS if you aren’t using it, but most of the apps that use it only turn it on as needed.