How to charge my iphone ?

hello,
please i want to know if i should wait till my iphone's battery is totally drained before i charge it , and if there is an accebtable percentage where i can plugg my iphone in the electric hose without getting the battery damaged.
what am doing is waiting for the battery percentage to reach 20% then i charge it to 100 % am afraid of charging it beforeit reaches 20% and removing it before 100% is that necessary to be done?
thank you

Allowing a lithium-ion battery to become depleted or drained before connecting it to a power source each time is not good for the battery.
You can connect the iPhone to a power source when at any battery level and it is not required for the battery to be completely charged before disconnecting the iPhone.

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