My lessons of the day... remember that the only meanings of 'too' are 'also' ('I want some too.') and 'in excess', 'there' has 'here' buried inside it to remind me it refers to place, while 'their' has 'heir' buried in it to remind me that it has to do with possession.
'your' is a possessive adjective, indicating ownership of something, 'Is that your sock or is it your potato?'
you're is a contraction (combination) of you and are, 'Do you know what you're doing?', 'You're the XYZ.