This is the 14th most frequent Hungarian word.
ha
"If."
In this sentence, 'ha' introduces a conditional clause, meaning 'if' in English.
Ha esik az eső, vigyél magaddal esernyőt.
If it rains, take an umbrella with you.
Here, 'ha' functions as a conjunction to present the condition needed for the subsequent clause to occur.
Ha kérdezel, próbálok válaszolni.
If you ask, I will try to answer.
In this case, 'ha' is part of a polite inquiry, softening the question to make it appear more considerate.