Do I have to keep enduring the Arrow to understand Flash ?

A third of the way into the 4th season I'm just fed up with the absurdity, the dislikable characters and the cheap ploys (come on two resurrections in just a few episodes ? seeing Diggle remove the balaclava from his brother was just the straw that broke the camel back) of the arrow. Is there some website somewhere giving me enough information to understand the crossover episodes in the flash (which I really like) where the arrow appears (and possibly Supergirl, I have watched three episodes and I don't like it yet) ?

I would like to be able to quicky understand what happened before a given episode of the flash while avoiding spoilers. It would be really easy to read too much on the wiki. It's my second time trying to watch the Flash but I had to stop because I didn't understand what was happening on the crossover episodes.