What is the meaning of Remember: A noun does not immediately follow a possessive pronoun while a possessive adjective always comes before a noun ?
A possessive adjective always comes before the noun because it qualifies the noun. But a possessive pronoun is not placed immediately after the noun. For example:
This is my house. (Possessive adjective)
That house is mine. (Possessive pronoun)
'House' acts as a noun in both the sentences.