To add for the discretionary traders out there, I think edge is also highly dependent on trade management as well as learning directional probability - you think there is a higher probability of the price going up 2 dollars as opposed to falling 2 dollars, hence that presents a trade-able opportunity. If you are unsure, scaling also offers additional opportunities
example - trader sells at A and then sells higher at second A and gets out break-even at third A. Or trader buys at first 1 and then buys more at second 1 and gets out break even at third 1. Most of the time the market offers these opportunities. The edge comes where the trader understands what's going on and makes the best trade management decisions - of course this is very difficult to do but not impossible
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