Let me know! 'what you think about' or 'what do you think about'

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi

The question is :

Let me know what you think about

Or let me know what do you think about.

Thank you.

2

Good morning Jam, I would choose to use the first of your sentences, although the second has little little difference in meaning…

If you were asking for this persons personal thoughts on the matter, then you could emphasise, “What YOU think about this.”

3

Jamilion, your punctuation is incomplete, and we lack context. You should use one of the following options:
1. - Let me know what you think about x. (You need a prepositional object here.)
2. - Let me know what you are thinking about.
3. - Let me know: what do you think about x?
4. - Let me know: what are you thinking about?

1 and 2 are indirect questions; 3 and 4 are direct questions.