Charging your battery overnight will damage your phone.
Smartphones aren’t called “smart” for no reason.
Devices nowadays are so smart that they know when to stop charging. It will automatically stop once the phone recognizes that the charging is complete. As long as you use an official charger or at least the input ratings should match, your phone will not get damaged even if you charge it all night long. (But, do remember that electricity is still running even though the phone is not charging.)
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Completely drain your phone before charging.
Older mobile phone batteries lasted longer if you drain them down before charging again because it was powered by NiCAD and NiMH, while smartphones today powered by a Lithium-ion battery don’t have “cell memory”, so it doesn’t matter whether you recharge it from 1% or 99%.
Keeping cards next to your phone will demagnetize it.
Smartphones do have a magnetic field but are much too weak to cause any damage to your card. A refrigerator magnet could do more damage to the card but, not a smartphone.
Drying your smartphone in a bag/sack of rice.
If you drop your smartphone to the water, some say that vacuuming it, putting it in rice shaking it and even using a hairdryer to it is one of the ways to dry it.
Unfortunately, they can be more damaging. A hairdryer may dry out your phone but also overheat it while the powdery starch that comes off the rice can work its way through the cracks and may end up increasing the damage instead.
Using incognito or private browsers will protect your phone.
Incognito mode will not save your data to your phone but your ISP still has your browsing history, but your activity can still be tracked. Also, it doesn’t protect your device from malware unless you add antivirus software on your phone.