If in trading apply fast trading strategy,
What obstacles are constraints
and weaknesses?
That would be close to be as day trading you trade or buy and sell at the same day which could also gain small win or lose. Not a very good starting strategy for beginners but this works if you got the timing right. You should know that the obstacles you are going to face are the timings, you must have a great timing in every trade or else you will waste not a lot but many scattered or unorganized money that you put on your investment.
End of the day the trade profit or loss needs to be meet by us. I prefer people to go with day trading only after gaining some good profit with gambling. Directly getting the day trading is high risk, because it is hard to predict the market without prior observation on the market.