I saw that phrase while I was studying and I don't understand.
Why 说的 not only 说? What does 的 mean in that phrase?
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In Chinese, noun phrases in the form:
nominal modifier + 的 + noun
may drop the noun when:
Clear from the context
This is the case where a noun is dropped to avoid unnecessary repetition.
This book is very interesting, who wrote it? (Who wrote the book)
Very generic in meaning
As in your case, the generic nature of the noun may be given by two factors:
他建议的（事情 / 东西 / 意见），我不太了解
I don't really understand what he's suggesting
The person / Whom I met yesterday is actually Chen Jie's best friend
The food / What I eat every day is what my mum prepares
The context of 我说的 in this sentence could be orders(命令), instructions(指示), teaching(教導), advices(建議), etc. It should go back to previous diaglog to know exactly what 我说的 is.
說 is a verb. It refers to an ACTION. Similar to SAY, SPEAK, TALK, TELL etc.
"你要按照我说的做并且要做好" means I have told you the orders(命令) or instructions(指示) or teaching(教導) or advices(建議) BEFORE. You should follow it and get things perfectly done.