>>/54158/
Caspian Report has an overview of the situation in Syria, from couple of weeks before.
https://youtube.com/watch?v=9k5JhKK6WlA
https://yewtu.be/watch?v=9k5JhKK6WlA

He points out that ISIS was started by officers of Saddam's army. And now Assad loyalist officers started to cause trouble.
Hayat Tahrir al-Sham holds middle Syria - Aleppo, Idlib, Hama, Homs, Latakia, Tartus - and currently counts as Syrian govt. and governmental forces, the Syrian army. They are backed by Turkey ofc.
South Syria is controlled by US and Israel via the Syrian Free Army and Southern Operations Room.
In the north Turkey rules via the Syrian National Army, and the Kurds hold the north east as the Syrian Democratic Forces, backed by the US chiefly, and partially by Russia.