Part 13: Rights of The Upright Scholars – [Etiquettes of the Student When Present at The Lesson of a Scholar]- By Shaikh Muhammad Baazmool and some beneficial reminders from Shaikh Bin Baaz and Shaikh Abdullaah al-Bukhaari
In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Shaikh Muhammad Baazmool [may Allaah preserve him] said: Among the etiquettes [of the student] when present at the lesson of a scholar:
 One should be eager for the lesson and carry on learning [listening, being attentive etc].  One should [strive] to understand the scholar’s expressions and indications.  One should face the scholar [during the lesson].  One should not busy himself with anything – whilst he is in the scholar’s presence- other than listening to him.  One should be eager to listen attentively and ask questions properly with good manners and not out of arrogance or obstinacy. Elaboration on point number 5: The purpose behind asking questions is to acquire understanding and know the ruling behind something, or to receive clarification of something that is unclear to you. This is why Imaam Ibnul Qayyim [rahimahullaah] said, ‘’When you sit with a scholar, ask to understand but not out of obstinacy – Meaning: ask to understand that which is difficult for you to understand – to remove ignorance from yourself and so that you can worship Allaah based on clear-sightedness, but not with arrogance and bad manners. [ref 1]
 One should sit close as much as he is able. Elaboration on point number 6: see link https://www.salaficentre.com/2014/03/imaam-bukhari-said-chapter-whoever-sat-at-the-farther-end-of-a-gathering-imaam-bin-baaz-mentioned-some-beneficial-points/
 One should not move too much, except when required.  One should abandon saying in too many words what may be said in few words during the lesson, even if he is given permission to make a comment.  One should abandon asking questions during the lesson and should only do so after the lesson.  If one hears the answer of a scholar [to a question], he should ponder upon it and strive to understand before asking a second time.
Source: [في قلب الحدث مقالات متنوعة – pages 50-51 Abridged and slightly paraphrased]
Ref 1: excerpt from a lesson of Shaikh Abdullaah Al-Bukhaari: https://www.sahab.net/forums/index.php?app=forums&module=forums&controller=topic&id=111243