Verified answer

The first one means you. The second one means you. The first one is the only one used today. When emperors were around nin (the second character you mentioned) was important. To the guy who said his ex-girlfriend told him to address her family as nin (respectful you) when talking with them, she is full of it. She just wants you to bow down to them and pretend like they are emperors, because they are probably really farmers who don't have much education, same goes for Korea and Japan.

When you see somebody older than you or a people enjoying high social position, you'd better use 您。 otherwise you use 你。

Both mean You, the difference is that 你 is plain version meaning its used with friends and people who you are on an even level with. 您 is more polite and used when you meat new people, used in formal situations and used when talking to some one who is higher than you or possibly older than you.

The example I was taught by my ex-girlfriend is when meeting her family I should address them with 您 but when talking to her or my friends I should address with with 你.

你 (ni) is you and is used with your peers and younger people. 您 (nin) is used to show respect to those who are your senior in age and rank, e.g. when you speak to the president of your country or company.

ä½  is to friends or someone smaller than you.

您 is to someone older than you.

你 is ni in pinyin in mandarin, and 您 is nin in mandarin. 你 means you, but 您 is also you, but used for strangers and stuff. You say ni hao to your friend, and nin hao to strangers.

The first one has lines, the second has lines in different places.

well im in Chinese 2 and i know the left one is ni, meaning you. the right one i dont know though