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Canslim has stood the test of time and;
equitrend has a 30 day free trial,
no credit card/debit card info required for 30 day free trial.
William o' Neil. inventor of nickname can slim, also;
mentioned ''10-15% prudent limit of total investment money in options.''
Lots of traders think because of the number of puts & calls , like $42 QQQQ is a key short term support & resistance level .
I use to tthink that ; but over the years , changed my mind & figure actually its because the option market makers are simply good at picking helpful short term S & R levels, like $42 QQQQ.