What’s happening in syria ?

Basically i’m asking who are the good guys & bad guys,I don’t have much insight about global arab politics,i’ve heard Assad is a tyrant dictator who is responsible for murder of so many Syrians & there’s rebellion happening in syria rn but those rebellion have ISIS and Al Qaeda badges on their uniform,using sophisticated ukranian drone & are said to be trained by NATO & are literally beheading people as I’ve seen videos on twitter(they might be old, idk) & what does nasarallah have to do with it(cause i saw people were divided when he was killed ,some were celebrating and some were mourning)I’ve seen news article that Israel supplies weapons to these rebels & the rebels also oppose Palestinian resistance

Can someone explain me like i’m a newbie.