Sa wR wB How do we know someone is reliable to take ilm from? Sh. in my masjid is young and to my knowledge takes from good mashayakh & I only know khayr of him even though idk him extremely well. He wants friendship w me and to teach me. What do I need to confirm before taking from him & if so how?

Look at his aqidah and his manhaj first, then that he is known to take from the recognised scholars and that the people of knowledge speak well of him, for Ibn Sirin said this knowledge is religion, so look at whom you take your religion from. If his creed is sound and you know only good of him then benefit from him, and keep measuring what you learn against the books of the scholars such as Imam Ibn Uthaymin and Shaykh Salih al-Fawzan.