Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
In Modern Hebrew, the most common pronunciation of Resh (רֵישׁ) is the voiced uvular fricative (유성 구개수 마찰음) [ʁ].
For pronunciation of Resh (רֵישׁ), Ashkenazi use sometimes a uvular trill (구개수 전동음, 목젖 떨림소리) [ʀ] or an alveolar trill (치경 전동음 齒莖顫動音, 혀끝떨림소리) [r]. English-speakers replace it sometimes it with an alveolar approximant (치경 접근음 齒莖接近音) [ɹ], as in English.