USING APPLICATION MANAGER
The easiest way to uninstall unwanted apps is through the Application Manager, which is found under Settings > Device > Applications. From there, find the All tab to see what's installed on your device. To prevent users from trashing items that are critical to the system's wellbeing, most can't be removed. But some apps can be uninstalled, such as Samsung Galaxy Life. For such apps, you will see an Uninstall button when you tap on them.
There will also be apps that are non-system critical, but which you can't remove, such as some of the Google and Microsoft apps, utilities, and social media apps. For these apps, instead of Uninstall, you'll see a Disable button. This simply hides them from your app drawer and prevents them from running, so it doesn't help if you're trying to reclaim some storage space. To reverse the process, just go to the Disabled tab to toggle the switch again.
The Application Manager is fairly restrictive, but you can still find some apps to disable.