Some tips and tricks to get the most out of your device

Battery life

Install an S7/S7 edge battery in your phone to increase your battery life by 50%. Check here for more details
Lower your screen brightness, this is a big power saver.
Reduce your screen resolution to 1080p or lower to lessen load in 3D Games
Disable the hardware navigation lights or use on-screen navigation
Use a wakelock blocker to stop unneeded wakelocks from GMS. (be careful with this one)
Run without Gapps - Google applications are very heavy these days. MicroG is a good alternative.
Use AMOLED dark mode (pure black)
Configure battery saver mode to turn on - this limits the clock speed of the CPU to something more efficient
Limit your charge to 80% to prolong your long-term battery health
Use 2G/3G instead of 4G radios when possible
Use an adblocker when possible
Use MicroG instead of full Google Apps. Google Apps are quite heavy on the CPU and are mosty unneeded

Install GCam Go or Open Camera for an improved camera experience
Use PlayIntegrityFix to bypass Play Integrity attestation checks for banking. Refer to general XDA for details
Install AOSP mods to tweak the way the UI looks
Remove bloatware/snake-oil apps that you dont use
Use cloud storage to maximize your phones local storage
When setting up fingerprints, instead of setting up 2 seperate profiles for 2 fingers, use 1 profile for 2 fingers (50% for one, 50% for another). This is faster than having to setup 2 different profiles
Install my TWRP for OTA updates

Always use updated builds where possible. OTAs are your friend
Don’t use old Android versions. I know it’s cool and all, but no apps work for it, and you leave yourself wide open to attacks. Android 10 or up, or you are wasting your time.
Don’t download random sketchy APKs from websites for “too good to be true” claims.

Create backups of your device sometimes - just in case.
Use a case and screen protector - this is super cheap these days and can protect your device
Don’t yank on your USB cables, the connectors are soldered on the phone motherboard so are hard to replace
Disable fast charging and don’t use wireless charging. Less heat = better battery longevity