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ESL means English as a Second Language. These are suitable for learning more English for non-native speakers.
English

Try to practice as much and as often as you can with family, friends, or online with some of the tutors on justlearn.com
English

"Friend" is a noun - a person who you know and like. "Friendly" is an adjective e.g. "he is friendly."
English

It is normally used to mean that something is "great" or "wonderful". However, this is an informal meaning, and it technically means "extraordinary" or "very unusually large" (although that final meaning is very, very rarely used).
English

I haven't spoken to all old people, but generally at least in the UK, I would say that old people don't normally say "nope".
English

P.S. means "post scriptum," in Latin and is used when you want to add something you didn't mention already. It is normally used at the end of a letter to add something that you didn't write in the main body of the text. Although, no one writes letters any more so you can use it verbally, or in texts or emails etc.
English

Learn British English if you want to learn the same language that the Queen speaks or struggle with spellings (colour not color, theatre not theater etc.). In all seriousness though, British and American English are mutually intelligible and there are only small changes to vocabulary, spellings and pronunciations (e.g. whether to pronounce the 'h' in 'herb').