Ok here's what I have understood so far. In brief, our reason for being in Syria I was first told was to stop ISIS. Then it appeared we were actually there to assist the many militant political factions oust Syrian president Bashar Hafez al-Assad. The U.S. I think wisely removes itself form that crap hole. Now from what I've read Turkey, a NATO member, has been for years arming anti-Assad forces and is currently encroaching on Syrian territory with the removal of Assad in mind. Now it is the Iran-led Shiite ideology and the Turkey-backed Muslim Brotherhood movements fighting.
With Russia back on the defensive standing in between the two trying to protect their interests in Syria again. удачи