A failing trade is when you have entered at the wrong time and at the wrong price so its harder for you to reap profit from it. Ideally, you should enter at a low price to sell high as a long term trader and enter at a low price to sell high also as a scalper but if you enter at a really high price already, its hard to make more pips as the price does not peak to infinity. It stops and turn downward at some points. You can tell by looking at the weekly charts. Also, not using stop loss can wipe out your entire account, and not following news and trading with the wrong pairs with high spread that are low in demand and trading during off market hours is a bad trade as there is lesser market movement for you to gain pips.