Customize and utilize the toggles in in the pull down bar.
Not using GPS, turn it off (this is a big one)
Not using wifi, trun it off
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Brightness level is another huge one. The screen being on is the #1 battery user. The dimmer your screen, the better. Using the auto-dim feature can help.
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Reception is HUGE. If you work in a place with really bad reception (hospital, factories, labs, etc) or put you phone in a locker, your battery will flat out nose dive. Like from 24hrs to 4hrs. And its exponentially worse if GPS and wifi are on.
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Smaller things, that will add up too.
Go into settings, click on apps and trun off notifications and autosync for everything. (unless you NEED to to be notified). Bigest one is email. It 'checks' for new email when you open the app. Which is fine for most people.
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Those small changes above will potentially add hours of battery time.
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Lastly, Most newer phones have battery save settings. My Samsung has multiple power vs perfomance settings that if I max out can get multiple days off one charge.