Thinking about how to use long VIX calls to hedge a diversified long stock portfolio. Any thoughts about smart ways to do that, like optimal strikes, deltas and durations? I don't have predictions about exactly when there will be a major market event that causes a spike in VIX but it seems like something like that is always looming so I figure why not be prepared. Right now I'm long at delta 0.10-0.15 for 90 dte strikes in range 35-50. The idea about 90 dte is to be prepared without timing events but I wonder if I need different dtes or deltas to be most effective. And how close do I need to pin the strike to be effective? When to close? Are there good books or other resources on this topic?