Trump is a greatest and Genius president of all time

It is ‘the greatest’ and ‘a genius,’ not ‘a greatest and Genius.’
You might consider mastering basic grammar before attempting historical rankings!
Before ranking presidents across the span of history, I’d recommend reviewing the indefinite and definite articles. Start small.
One hesitates to evaluate your political analysis before addressing your struggle with basic articles
 
Please note that, the omission of the "Indefinite Article (a)" before the word "Great" does not affect the grammar in the sentence.
Kindly advise please.
 
Please note that, the omission of the "Indefinite Article (a)" before the word "Great" does not affect the grammar in the sentence.
Kindly advise please.
You cannot say:

“a greatest president”

Because “greatest” is a superlative adjective.
Superlatives always require “the”, not “a”
“The” best, not ‘a’ best, “the” highest , not ‘a’ highest, “ the” fastest not ‘a’ fastest
“Trump is the greatest and a genius president of all time.” (grammatically correct, still opinionated) or more naturally
“Trump is the greatest president of all time and a genius”

In the same line, you can not say
“Kindly advise please” It is double politeness and redundant
Just say “Kindly advise”or “Please advise” , polite and professional
I do believe that you wanted to say
“Please be advised” or “Kindly be advised” as a matter of information or asking me to take note
 
You have quoted me out of the context. I never said you can use the indefinite article before a superlative adjective but you can instead use the definite article.

However, Kindly advise (please)" is a formal, polite phrase used primarily in professional emails to request information, guidance, or instructions. It means "please tell me," "please provide instructions," or "please share your thoughts". The phrase is grammatically correct.
 
1. Refer to the headline
2. Refer to your first comment on my response
3. Refer to my explanation/response to your comment
Read to understand not to respond!
you can not say kindly advise please , it is redundant, double politeness much as one says “repeat again”
You may use that but grammatically is not correct
 
No the phrase "kindly advise please" is grammatically correct, take time to make further investigation.

But in reference to the phrase "repeat again" or "return back", it's a different ball game as these tautologies are redundant and technically incorrect in formal English.
 
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