There lots of ways to do day trading, and the strategy below is one of the ways to conduct.
Trade in between is one of the surest way to make a positive outcome, but doing so is to have patience in waiting, looking for the right entry, and recognizing a pattern.
Pattern recognition is one of the advantage how to spot if there is a probability to place a trade, takes time to learn, but if you really want to participate in the market, it's one of the steps to study and to learn.
Other than that is to read the minds of the market, watch the tape, the price movement at a given time, the support and resistance, where the chart formation takes place. Also takes time to learn, but that is where the right price to enter and exit.
Also, the market environment during the day, if there is market moving indicator that is schedule for the day, if it is right to get involve or not. Cannot trade the market all the time, be selective with the day and time to make a trade. If the bars are moving fast and the tails are long, might as well wait for the market to settle. Wait for the small bar(s) in consolidation, that is where to determine where there is probable breakout or breakdown.
Below is a chart as a reference to make a trade.