Battery Question - Galaxy S6.

A

AC Question

So i bought my phone about 3-4 days ago, and i would like to know how i should charge it. I mean i don't want to destroy the battery.. I heard that is bad to let your phone discharge to 10-15% and charge it to 100%. You should charge it when it's 40% and let it charge till it reaches 80% so you have to keep it in between 40 - 80%. Is this just a myth? How should i charge my battery?
And the second question, what happens if i let my phone powered on at night ( 24/7 ). Should i turn it off at night or i can keep it on for ever?
P.S: Sorry for my bad english.. it's my 2nd language. :(
 

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