Dear Professor Y,

My name is X, and I have been encouraged by you to apply for the PhD program. I submitted my application about 3three months ago but its status is still pending. Since it has taken a long time, I am trying to learn supportive materials by myself. Currently, I'm trying to learn how to use Arduino boards, but I'm a little bit uncertain about which software to learn next. Would you please give me ansome advice abouton what software I should I learn so that, if I acceptedam accepted for the PhD program, I would be better prepared.prepared?

Thank you very much for your time and attention.
I look forward to hearing from you.

Sincerely,
X