Battery health on my iphone 14 pro max drop to 99%

I bought my new iphone 14 pro max on february and today i saw the battery health drop to 99%.

i rarely use it for gaming, only use for tiktok, yt or twitter and social chatting. I didn’t use it like any time.

I charge it on 50% and unplugged it on 100%

is it wrong to do that? Is it normal? I am so worried, because it’s new. Did i charge it wrongly?

what percentage should i charge my phone and what percentage should i uncharged my phone?

some of my friends said charge it at 50% not below that and uncharged it on 85-90% because the damage because i uncharged it at 100%

help please.. i am so worried because i am scared.. its not even 2 month yet…