Can you guys help me on how to charge my 2012 macbook pro.

I need help on how to charge my Macbook Pro (Mid-2012). I'm new to the Mac environment. I just bought this mac last december 30. And I'm really impress on the mac. especially on the specs of macbook pro but im really curious about the battery of macbook pro like how to charge it and how to maintain it nice and long lasting i saw some articles including apple that they said that i need to calibrate or cycle charge. What do i need to do? cycle charge or calibrate? but i saw some articles that they said i should'nt do a calibrate because macbook pro 2012 is pre-calibrated. and i don't really get the cycle charge, can you guys really explain how to do a cycle charge and when? every week, every month or every day? and what percentage do i need to cycle charge? 25%, 50%, 75% or what? Can i charge it overnight? can i leave it charge for 9 or 15 hours because I'm to going to school and i didn't bring it to school? Can i use it while charging? can i use it while charging for the whole day? when do i need to unplugged it? What do you thing guys do i really need to calibrate my Mid-2012 Macbook Pro? And I saw this stats on a app called Battery Health and I saw my battery health it's 98.6% (5692 mAH) from the original (5770), when i saw this i panicked i thought i messed up my battery because it got this stats in just 3 days after i bought it. I really need to know these answers. I really need help. I wish my co-apple users answer my questions and give me some tips. THANKS TO ALL IN ADVANCE.