Navigate your phone settings and first go to about phone. From there go to software information. You should see your build number. Tap the build number several times in a row and developer options will be unlocked. This gives you access to developer options and a whole new set of customization features
Real YSK is be careful with these features and settings if you’re not sure what you’re doing. Some of them have security implication. That’s also a security good practice to disable developer options when not needed. But yes, go in there and have a look, it’s interesting